Well, it’s a bit paradoxical, or chicken/egg, isn’t it? If more people leave, including voting D in the general election, a smaller and more conservative R party may be inclined to pick more rightwing candidates, but those candidates also have to have broader appeal in order to win, so need to be more moderate.
Some of that will be addressed by just voting D in the general, but I wonder how much people who voted for the saner candidate in the primary convince themselves that that person is actually moderate, and vote for them in the general, too, if they’re the nominee.
I’ve considered whether it would be helpful to switch my party affiliation to try to exert a moderating influence in the primaries, but I do still want a say in my own party’s primaries, and, Rs in my state are leaving their party at a fair clip, so I think there’s a different set of forces at work. Joining (or for existing Rs, staying) works against that process that’s already happening.
One thing to remember about the reddest of red states: For many of them, they used to be Democratic strongholds. Now, part of this is about the politics of the parties changing, but it shows that which party is dominant is changeable. It isn’t like, once a party has dominance, it cannot be beaten, and thus is the only game in town. In fact, it seems highly relevant. Racist Democrats realized that the Democratic Party no longer represented them, so they moved away from that party and eventually the Republican Party became dominant.
So, moderate Republicans who are no longer represented by the Republican Party could move to the Democratic Party and potentially restore the dominance of that party, or at least make it competitive.