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.
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I agree with the general point of your post that were not near revolution and need to focus on working class organization, I just have a few nitpicks.
You're right Biden won't slow this down, but the right has been hearing up for this seriously since Obama was nominated for president. There's a limit to right wing organization outside of the state apparatus in a fascist (or falling into fascism) country. Not to say they aren't useful allies of fascists, just that there's a limit to outside right wing organization.
Richard Spencer is a grifter and has been struggling for money for a long time having been deplatformed as a Nazi, he endorsed Biden to try and get into liberal circles imo. Not for any ideology, but for the money.
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Yeah I completely agree, and that would seem to support that having a president that doesn't outwardly support them would be a detriment to them at least in the short term, no?