Will the electoral map become more progressively difficult for the republicans?

[Hope For A New Era]

I think it will for a while - maybe the 2020s decade - but certainly not forever. Probably there will be a period of Democratic dominance, but we won't be a one-party nation. Republicans will have a comeback eventually, probably through a move of both parties toward the center as happened in the 1990s, and we will have about 15 wonderful years of relative unpolarization before the partisanship monster rears its ugly head once again and the cycle continues.

As for anything else, though? Only time will tell. Watch, in 30 years Louisiana will be Democrat and Oregon will be Republican, or something. I mean, who would have predicted Virginia's violent jerk to the left since 2017, or Missouri's nearly-as-fast rightward shift during Obama's presidency?