Betting any further out would make me presumptuous. :) I really cannot be so bold as to say I know what the far future holds, and I can only make educated guesses about the near future. As far as domestic policy, deporting illegal immigrants is a far cry from genocide (FWIW I am pro-immigration anyhow).
At least 50 percent of our country is to the left, and probably less than 10 percent of the country is on the extreme right. There is enough healthy disagreement that I do not see one side assuming authoritarian-level power any time soon IMHO.
Of course there's a big difference, but the Nazis didn't start gassing people the day after they took power; as late as 1940 they were considering just resettling Jewish populations in Madagascar. The chilling fact about the Holocaust was not that it was directly ordered from the very height of the Nazi government as that lower-level officials decided it was the most practical solution to an operational problem that seemed compatible with Hitler's fanatical loathing of the Jews.
My anxiety about this stems not from any belief that this or a future administration has a detailed plan to murder large numbers of people, as from a coincidence of political momentum and the existence of a decent number of people who would be just fine with or outright enthusiastic about that outcome, as well as a much larger number of people who'd rather just look the other way any time unpleasant topics appear on their radar.
I have much less confidence that you do about demographics and the health of the body politic. Just to add some context I'm not basing my opinions on blogs but on lengthy analysis from military intelligence professionals, counterterrorist analysts, and other high-quality primary sources, as well as extended personal study of the far right. I hope I'm wrong about this.
At least 50 percent of our country is to the left, and probably less than 10 percent of the country is on the extreme right. There is enough healthy disagreement that I do not see one side assuming authoritarian-level power any time soon IMHO.