Maybe if Biden gets 1 term and Harris gets 2 then we'll have 12 years of a return to normalcy instead of just 8. And maybe that will be enough to turn the tide.
But yeah I have to mostly agree with your analysis. I tried twice to write up posts that tried to refute your main thesis. Both were even more depressing than what you just wrote. All we can do now is take it one step at a time and try to move forward.
The main reason I think the US has a chance is that I believe that there will be one HECK Of a lot more push back against the efforts of Trump supporters to sabotage Biden. When republicans shut down town hall meetings nationwide in Obama's first 2 years over Obamacare deliberations, democrats basically just flat out surrendered and folded. Which led to republicans having a really good mid-term election in 2010. I doubt that democrats will be quite as accommodating this time around.