I know this is an impossible question, the future is chaos, but we can at least identify and discuss some key factors.
When I say "successful leftist revolution" I mean one that happens soon enough to prevent, or have non-negligible odds of preventing, the collapse of human civilization as we know it due to climate change.
In all likelihood I think we're fucked as far as climate change is concerned, but we should still try to improve our odds. There's no prize for correctly predicting that we're fucked.
I'm starting to think that Balkanization is the best hope we have for eventually creating revolutionary conditions as it would at least break the imperial stranglehold the US has over the world (and this is different from accelerationism), among other things. Say if Trump won under obviously corrupted conditions or he straight up lost but was able to somehow stay in power (and Biden is just like "aww shucks Mack I guess there's nothing I can do but give up"). It's a long shot, but if that happens I think there's at least the start of talk of secession on the west coast. I don't think it would go anywhere yet because I think capital would make the case that it would be a bad idea economically for a state to leave the union. But I think it gets the ball rolling and if Trump and the GOP then go full mask off fascism then I could see Balkanization maybe happen over the next 4-5 years.
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I think they were saying that's fine because it stops American imperialism.