Impeaching Kavanugh wouldn't prove much of anything. Too many trumplicans in the senate.
I imagine Mueller will get back in the game after the election by starting with another avalanche of indictments, but his final report on trump will have a hard time ever seeing light of day. Trump the treasonous prick could probably do legal rope-a-dope as long as he needed to be able to ignore it, hopefully only until he gets defeated in the next election.