I think your opinion is a bit over the top.
A state choosing to vote its electors per the national popular vote, rather than the state’s popular vote is a decision to lose state “sovereignty”, and to essentially let 49 other states decide how your voters should have voted. That’s true even if your a big state like CA, FL, or NY. And it’s vastly more true if you’re a small state like WI, or increasingly, MI.
IOW, it’s exactly opposite to state’s rights, state individuality, and all the other anti-federalist stuff the Right believes in.
You do have a point that the right has had a history of favoring various politically motivated rule tweaks that benefitted them when they were the minority party, and they’re now concerned and back-pedaling those same tweaks because those tweaks are hurting them now that they’re in the majority.
E.g. state legislature term limits were excellent for pushing out the entrenched Ds. But now that they have entrenched Rs running out of time, the necessity for fresh faces is seen as a problem, not a solution to a problem.
If indeed the R legislature in a mildly D-for-Prez state tried to alter the rules during this election they’re gonna get stopped in court. And them voting in changes for 2020 is implausible. As you say, demographics is against them. What Rs want is system that respects the popular vote less, not more.
Compared to the Ds, the R primary system has more instances of winner-take-all, as is their elector selection system for the electoral college.
Which has the effect of focusing more support earlier at the leading R candidate n both races. There certainly have been years when the D race was full of contenders running on proportional delegate allotments, all unfocused and full of internecine warfare, while meantime the Rs had already coalesced around their standard-bearer.
Bottom line:
Proportionality has one set of features; winner-take-all has another. Each is advantageous in different circumstances. Only someone ignorant of history maintains that either is good or bad.
A state choosing to award its delegates to the national popular winner is the limit-case of winner take all: A president who got *one *measly vote more nationwide would be elected in the electoral college by a 100% to zero% vote. That does not sound like something a beleaguered and back-pedaling R group would back for the future.