Has the Democratic Party reached the point of no return or will another bad election loss bring them back to their senses? We will see. If they continue down this road, they will become a permanent minority party.
IMO, it will take several drubbings in multiple elections before some sane people can start to slowly pry the crazies fingers from the levers of power in the Democrat party. Look how long it is taking for MAGA to slowly push all the Establishment RINOs out of the Republican party. Its been almost 10 years and RINOs are probably still a majority of the Republicans in Congress. We are going to have to go on purging them in primary after primary for years until we’re rid of them.
As long as they can gerrymander seats in the US House and look popular as a result, the dems will continue to be the way they are. If the republican congress could/would do its job and come up with some federal standard for district size and shape, then the dems would have to become more normal.