A part of me thinks that had Kamala, or anyone else for that matter, been the candidate from the get go, things would not be looking this good for Democrats three months before elections. The momentum shift caused by Biden dropping off is unprecedented and has backed Trump into the corner, all his moves so far (including Musk interview) have failed spectacularly and have only pushed him further behind. And it took almost no action at all from Kamala to cause this, she started off being largely deemed an underwhelming candidate, did virtually nothing and is now being looked at in a much more positive way simply because she hasn't been able to feck things up.
Far from over but things definitely looking good. Realistically even if Kamala wins now, the nutjob will be back in 4 years trying to claim the 'stolen' elections back again.