They would last MAYBE one term before they were instantly primaried and removed from power.
The reason manchin and sinema are so destructive is that they were from INCREDIBLY purple states. Going up against them would just split the vote and guarantee the republican candidate one. fetterman is more of a special case and time will tell on him.
The other? To get elected as a magat you need to be a pretty hateful son of a bitch. And people are already turning on AOC for removing her pronouns from her social media bio.
Because... just look at the Bernie Bros. Democrats are INCREDIBLY good at purity testing each other. So someone who pretended they wanted to enslave women and then voted for progressive legislature? They would be forever tainted and vilified... and kind of rightfully so.