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Material conditions will inevitably worsen as imperial super profits decrease and the bourgeoisie desperately try to hold on to their dominant position, looking to pillage whatever they still can. Crises will get worse and more frequent. The effects of climate change will be more apparent, massive disasters killing thousands in the US and even millions abroad in more vulnerable places. Economic disasters of a scale never seen before in history. Countless new wars, conflicts, and struggles, both home and abroad. Support will increase as it did with the Bolsheviks. The Bolsheviks had some ~10,000 at the start of 1917, by the end of the year they had half a million.
I don't think they'll grow to threaten the US state during his last administration. They're still less of a political presence than the Libertarian Party, for example.
Well no, of course not. But Trump is obsessed with a boogey-man. He did say he'd destroy the radical left or whatever this election cycle. So it won't surprise me if he does target them.