The next Republican president after Trump wins by improving with the urban working class. Think winning outright in places like IL-03 and MI-05 and going from 15% to 35% in a bunch of VRA districts.
Probably this, but they’d also hold their own in most suburbs/exurbs in the North, which have seen less population growth than the metropolitan areas of the South and where the effects of generational turnover and migration have been less dramatic. Think places like PA-01.
I think the jury is still out on this until we see if/how much Biden improves over Clinton in the North. If education polarization continues, the 3 most college+ swing states are actually NH, MN, and ME in that order. Could this explain the big Biden snapback in polling of those 3 states vs. other 2016 swing states? I agree that places like WI/MI/OH/IA are gone for Dems in the long run, and if you are betting on education polarization over racial polarization, alarm bells should be going off over New Mexico which less college+ than Ohio! Though perhaps that is mitigated by NM having a ton of postgrads?