I don't worry too much about the alt-right or stormfront. Frankly, the only time I ever read about them is when other liberals talk about them. Kind of like David Duke. I've never read a word he has written, but my god, have I read his name 1000 times from various liberals. I just feel some people give these loons way too much attention /Rant
To go to your point, I don't even see "race war" as relevant either. Most whites are probably quite comfortable even as a minority. Why wouldn't they? They have disproportinate control. But some people will want
all
control.
And even beyond that, beyond control, I also think it's about culture. America to a minority of whites has meant a very specific Western culture. As the demograhic becomes more mixed, so will the conception of what it means to be American etc.
So, to my mind, the whole jumla about "race war" is overblown and retarded. What we could see, instead, is maybe 10-20% of US whites becoming radicalised. But 10-20% out of 200 million is no small number. See my point about balochistan or even Sri Lanka. Ethnic conflict tend to be a small, but not too small, minority feeling threatened or isolated.
I'm not even worried about white vs non-white. I'm more worried about white leftists and their response. It could become radicalised as well, and escalate uncontrollably into violence, which would make the tinderbox go boom. If you look at the WWI and WWII, white right-wingers and white leftists can be very brutal to each other. I wouldn't be surprised if brown Americans acted as peacekeepers and negotiators in the future because white Americans would be at each other's throats.