Actually, if there is evidence of using the powers of your office for personal gain, it is illegal. Rich is out, no way it could be overturned, but depending on where money trail goes to and comes from, they may push pretty hard for prosecution.
I'd hate to see them trash the entire ability, but it's unlikely they could even if they wanted to. More likely are ammendments making the accepted protocol required instead of just being a good idea (like justice department review). I like the idea of having to be in before the vote. Even if they're not up for reelection they're not likely to want to embarrass the party too badly.
Also brought up was the possibility of Senate overturning on 2/3 majority, though I'm a little uncomfortable with that one.