The Democratic Party started working with disaffected GOP at the end of the election rather than their own constituents yelling for representation.
They find this slide in tyranny more acceptable than fighting against it.
Anything would have worked in 2020 as long as it had a pulse and wasn't named Trump. We got Trump policies with Democrat faces - there's no need to wonder why Democrats and left-leaning independents didn't rush out to vote in '24.
Trump will try a dictator power grab. This isn't even questionable seeing as he already tried to do this. The only question at this point is if everyone else in power goes along with it or they scoff like they did last time.
Seeing as how there are a lot less principled people involved, and the oligarchs enjoy the idea of personal techno-fiefdoms the odds are at least non-negligible that the USA as a democracy could end.