When joe byeden refuses to drop out and loses to trump do you think mainstream dems will blame it on the people they propagandized into supporting joe no matter what not breaking their programming?

You forgot the Russians and the Chinese.

Basically they'll just blame "the left" (reminder that the left essentially doesn't exist in the US. Certainly it has no political power. There are like 5 vaguely socdem people in congress and that's it)

There has been an ongoing McCarthyite anti-communism or really just anti-left hegemony since the last Red Scare that has only recently in the last ~10 years started to fracture even in the slightest where it has become acceptable in non-MSM to discuss obvious concepts like the adversarial relationship between labor and owner classes. This simultaneously scares all the olds and, strong Venn diagram overlap (shoutout Kamala she loves Venn diagrams) infuriates them.

There's absolutely going to be more and more overt oppression to anything "left." "No more Marxist studies?" One might be tempted to think... nah. Remember the liberals, reactionaries they are, consider everything on that list to be "left." The republicans/far right liberals have already begun this strong overt McCarthy revival in earnest and recently on the issue of Zionism and its utter rejection by younger Americans the democrats/liberals have thrown out any and all notion of having tolerance for any sort of left movements or even leftist study, thought, etc. And to them, one can't forget, non-"Western" aka non-white centric thought, non-USA dominant thought, etc. in that vein, is "leftist thought" that more and more are simply saying "no more" to.

The far right in the US has totally and fully taken over the window of acceptable discourse, again seen most recently regarding Israel and Palestine, and the resolution to this will be more and more harsh state pressure placed on people who continue to not simply shut the fuck up about the evils of empire. They'll all be called "the left" and all actions seen as necessary to shut them up will be employed... by people with D or R after their names.

The outcome could be a full unification of all the vaguely-left movements and sort of a "Castro being forced to go commie" moment.... but, the more likely outcome considering the current political miseducation situation in the US and the lack of any socialist, communist, or even leftist anarchist substantial organization is mass (further) oppression based on identities you listed, strict outlawing or other subduing of all leftist discourse (or anything close: labor unions banned from discussing real, actual labor dynamics), etc.

In short, massive purges, crushing all budding organization, similar to the past but because there doesn't really exist the organization that had existed in the past (black panthers, etc.) to be crushed, the crushing will be much more random-seeming, more broadly applied, what is seen or deemed of "the left" will be a wide wide net and has all the potential to just spiral in straight mass hysteria of "Chinese infiltration!"

I hope all of that doesn't happen, but at this point what other direction seems possible and probable... the only question is the timeline of events.

In the most short: we're fucked. This isn't dooming, I see potential ways out and we should be pushing for whatever holds off the worst excesses of liberal hysteria, it's just the way things are going. I wish it weren't true, I wish we had a solid core of dedicated would-be soldiers in the future protracted people's war... but that's just wishing and dreaming.