Like I said, I don’t expect necessarily them to be literal Nazis. I do, however, fear they’ll be just as bad — much more so than another Franco or Pinochet, thuggish strongmen that they were. For me, some ideas that come to mind are the Christian version of ISIS or an ultra-reactionary Khmer Rouge, so I’m not restricting myself to just one pre-existing template here.
Besides, just because the Populists are on their way to becoming a multiracial force doesn’t mean their leader won’t escalate the purging and scourging far beyond what was initially promised. After all, the Communists trumpeted universal brotherhood, too, yet that didn’t stop Stalin from implementing his own ethnic cleansings, or Commie apologists from twisting themselves into knots to justify their own genocides while excoriating Hitler for his. Extrapolating from that, I can imagine a Populist leader who Holodomors “Jacobin France!” or exterminates “Swiss banker swines!” wholesale, and has no problem being a bitter and hypocrite jerk whenever it suits him. Plus, even if he’s not white, the odds he becomes another
Lazar Kaganovich who gleefully purges millions of his fellow minorities still aren’t non-zero. So, really, I see no reason to rejoice about what’s to come, and believe you’re too “deterministic” in your thinking and sense of how well current trends forecast the future.