I think a major demographic that would be big if Trump were to win with is Asian-Americans, too. Considering in 2016, only 35% of Latino men supported Trump, it is not insane to believe that the Republicans could reach some of these minority groups. For 2024, 39% of Asian-Americans voted for Trump. If the Democrats lose Asian-Americans, they will see a substantial loss in their advantage in California, as well as New York and New Jersey. My guess is that Asian American men, in particular, will likely swing right more and more as time goes on.
The biggest obstacle would be to de-fortify California.