I think the premise of the OP is actually how many in GOP leadership perceived their situation back in 2010 or so, and likely still in 2012 and even up until election night 2016. However, perceptions do not always match reality. But let’s first deal with the perception–it is absolutely the case that the form of cultural revanchism that is cherished by evangelical Christians / Christian Nationalist etc (who are predominantly, but not exclusively, white and most of their leaders are men, but they obviously have the support of patriarchy-supporting women) is viewed as “being under attack” and by an unassailable “horde” of blacks, Hispanics, homosexuals and “effete” liberal whites. This belief is a core part of why they no longer support democracy.
Now the even worse part is I think the perception may be wrong. Specifically, the perception is this cultural revanchism is a dying candle, sputtering on its final flames. However, I can actually see a situation where even without undermining democracy, this flame can not only keep burning, but come to dominate the country. How? Because the electoral college, Senate and even the House disproportionately favor lower population rural states, and Republicans dominate those. Additionally, several important states like Florida and Texas, that if you squint right and turn your head right, you could sorta imagine turning blue at some point based on demographics. Except…that probably isn’t happening. Why? Because the demographic changes in those States is making them less white, and if the political battle lines were drawn where they were in say, 1995, it would be making them bluer. But the political battle lines are now turning much more on conservative cultural issues than on economic issues. Democrats economic message worked pretty well with Florida’s non-Cuban Hispanics and Texas’s Mexican-American / Tejanos population. The problem is, the Democrats cultural message doesn’t work with these groups at all. The Rio Grande valley may be historically in favor of things like universal healthcare and robust social welfare, but they are anti-abortion with the heat of a burning furnace, and when the cultural argument defines politics…these voters are actually drifting red.
The other big issue is a number of other swing states don’t have quite that racial demographic but they do have that political demographic. Minnesota, Wisconsin, Michigan and Pennsylvania are not getting that meaningfully diverse ethnically, and all are slower growth rust belt states. Most of them were traditionally decently decent states for Democrats. But the Democrats power in these States was largely based on labor unions, which have basically been obliterated into nothingness politically. These voters now don’t feel any economic affiliation with Democrats, and just like Florida’s Cuban American population or the Tejanos, all of these blue collar whites have basically always been culturally conservative. But historically cultural issues weren’t the be all end all, the fissures existed, but they weren’t so stark. One reason they weren’t so start is cultural conservatives and liberals used to exist “cross party”, while more were GOP than Dem, there were tons of culturally conservative Democrats holding Congressional and Senate seats in the Rust Belt, that now isn’t much of a thing, and the Democrats are going to struggle to win elections here–and it is likely to get worse.
While the high populations of a few coastal States might continue to mean Democrats rack up big popular vote wins in Presidential elections, the fact is most currently contested states are trending red due to cultural issues.
If we look at swing states, here is a list that shows each swing state, its number of electoral votes in 2024, and my analysis on whether it is trending: Democrat, Republican, or “Hold” (meaning it will likely stay a swing state.)
Arizona (11) - Democrat
Florida (30) - Republican
Georgia (16) - Democrat
Iowa (6) - Republican
Maine (4) - Hold
Michigan (15) - Republican
Minnesota (10) - Republican
Nevada (6) - Democrat
New Hampshire (4) - Hold
North Carolina (16) - Hold
Ohio (17) - Republican
Texas (40) - Hold
Wisconsin (10) - Republican
So of this current batch of swing states, we have 3 states representing 33 electoral votes “trending” Democrat, and 7 states representing 107 votes trending Republican. Worse still–of the 4 “Holds”, Texas and North Carolina (representing another 56 electoral votes) are “Holding” with a red lean, Maine and New Hampshire will hold with a blue lean, but only represent around 10 electoral votes.
The unfortunate thing for Democrats is increasing extreme political polarization, increased “sorting” of progressives / liberals out of rust belt states into coastal ones (where their votes are largely wasted) and etc likely mean these swing states do keep trending in their current directions and become “less swingy.” Meaning it isn’t at all unreasonable to assume by 2028 or so there’s only 4-6 swing states left.
Where does that leave it? It leaves it in a real bad place for the Democrats: if the above trending states converge into being red or blue, then before ANY remaining swing state is factored in, Republicans will be sitting on 272 electoral votes. That’s ball game. If the Democrats win all the remaining swing states they will only clear 265, and their hope of victory will be on the most competitive of the “new” red states–likely places like Michigan and Minnesota. But Democrats can only even be in fighting position there if they win literally all the remaining swing states and only if the couple of states trending their way…stay trending that way. The scary thing for Democrats is it’s an open question really if Arizona and Georgia which are genuinely showing signs of trending blue, will keep trending blue enough to secure them reliably. It could be the situation is even worse for the Democrats.
Note that if Senate races follow this map–which is becoming more and more of the norm, States electing Senators that don’t match their Presidential vote is a dying concept, the Republicans will have a hammer lock on the Senate and the White House likely for generations without cheating at all, just using the 1788 constitution that made a compromise with small states that enshrined them into permanent power in the Senate and electoral college. Note we made a very bad choice as a country to exacerbate that problem by adding 37 additional states with no real consideration of population sizes.