Republicans will not get any sense regardless of what happens.

The only important question is whether Democrats will get any sense if they win.

The worst outcome is actually Democrats winning and then keeping the status quo and continuing to serve corporations and special interest groups over the needs of their own constituents.

They won't have any real power to force through legislation even if they win, but if they win and don't use this time to shake up their own party and instead keep Schumer/Jeffries/et al in charge and keep towing the center-right Third Way-esque line then in a few years time we will find out that actually, yes, there are worse people that could be president than Trump (all of the malevolence, but perhaps with competence too next time).

Every election for over a decade has been a change election and the Democratic party refusing to understand this (because the consultant class and their high value donors don't want to understand it) is one of the primary factors in creating and enabling Trump. And it isn't yet clear they intend to address this. I mean, people are still taking a Gavin Newsom run in 2028 seriously ffs.