I can't say that I'd blame him if he did.
Rick can't get a feel for the team because the players are either habitually injured or inconsistent. He didn't put this team together and he didn't choose these guys to go to war with. The way the Artest situation was handled (or rather mishandled) is not his fault either. You need to look further up the ladder to find the true culprits.
If he tires of the drama and quits I can't say that I'd blame him. I'll be extremely disappointed though because I think there are only 2 better coaches in the entire league - Popovich and Larry Brown.