I can see OH, FL, VA, CO, NV, NM, IA, NH being flipped-—all were carried by GWB at least once.
Depending on who the GOP nominee is, he could even pick off a solid blue state such as WI, PA, or MI.
One thing we know, things do change.
I do agree that changing demographics help Dems.
The last time WI went Rep was 1984; PA 1988; and MI 1988. Demography is destiny.