Exactly. Trump did better with Hispanics than Romney. If Trump could get Romney's white vote share, it would've been a 10 point victory at least. While I do believe Arizona will go more in New Mexico's direction over time, the GOP will still have an advantage in the near future.
Giving up on Ohio and Iowa is a big deal. It also means that PA, MI, WI, and MN are proabably competitive too, and winning Arizona and NC wouldn't be able to offset that.
100%.
Romney got about 66% of the white vote in Arizona, and only about 20% of the non-white vote (including Latinos). Trump got only 54% of the white vote, but 30% of the non-white vote.
So if Trump can even pick up half of the lost voters he can get to 60%. If he's able to do that and just barely improves with non-whites he easily hits 52%+ (I am probably correctly assuming third parties won't even be half as significant in 2020). The GOP "ceiling" in Arizona is still over 53%.
Romney really hit the bottom of the barrel in terms of votes with minorities. What a crappy candidate. He tried to pander to everyone one thus he appealed to no one.