More elected Ds will be of the vocal, strident, socialist, ban-ICE wing of the party.

I am not sure this is the case at all. I think that existing blue seats, when they’re being swapped between and old and new Blue, will move left; but a Democrat elected to a Red seat is winning because of Blue enthusiasm, which comes from Trump-hate. Remove Trump, the enthusiasm returns to normal, and the Blue congressperson, if he or she wants to KEEP that seat more than 2 years, will have to vote their district, and not vote far left.

In short, we may be seeing the re-establishment of the Blue Dog Democrats.