I think it would just force Republicans to go all in on the industrial/post-industrial Midwest and retirees (hold Florida, NC, maybe not get wiped out in AZ), on the assumption that the South is giving out. There would end up being little or no difference in family income between the party coalitions. Democrats are gradually able to contest the Plains and Republicans the Northeast (except for MA as Boston seems to be following the Southern/Western metro trajectory). Small cities become the most important electoral battleground.
Yeah. As I said, An upset for Republicans in a Democratic state in the Northeast will open up more options.
