Foley and all of Hart's family flew home before RAW the night after, and all were talking of quitting, plus most of the roster was talking about boycotting if Bret didn't intervene.
Personally, if something goes down, I think it's as simple as HBK getting his ass beat. Fooled me one, shame on you. Ain't gonna get it by twice, embarassing Bret on such a big stage. And Shawn still has his enemies and Bret still has his friends, most notably Austin, who at this point is past needing Vince to survive.
If something did go down, I doubt it would involve HBK. That would ruin the WM match between him and Vince. On the other hand, if Vince did anything (maybe with the help of HHH), that would fuel their match at WM.