A combination of in-migration and shift in party stance is needed to rapidly turn a region to/from a political party. And of course, the smaller the state, the more likely the shift. Vermont is a good example of this--a small state that was always Republican but in the New England/Northeast/moderate stance. A small migration of people into Vermont and the rightward movement of the Republican Party took about a generation for the entire state to switch parties.
I could see hip places like Boise and Salt Lake City continue to trend leftward and could move their corresponding states move in that direction. Not to change the state (because they are simply too conservative) but at least to win more congressional and state legislature seats (and potentially become competitive at the statewide level for gubernatorial and Senate races).
Of course this is all hoping that there is ticket splitting in the future. There should be but it hasn’t looked too good for it lately. In Utah and Idaho, I definitely see each state having a swing district while the rest of those districts are unanimously Republican save for the usual suspects.
Basically people "trying to get away from it all"(my parents) or who don't have anywhere else to go (me my first year out of college) that are the only people who are voting Democrat in districts like that.
