I support generally everything Bolton has said about the UN, but don't think he is the right man for the job as a diplomat. I would be all for getting out of the UN, but if we are going to stay (which we obviously are), then we don't need a name-calling, rabble-rousing bully serving in the role of Ambassador. Not that there is anything wrong with any of that, its just that it is silly to think you can make comments like that and then expect people to be be friendly with you.
Diplomats can only do what Presidents let them, so I am not particularly concerned by his loss, and think it will probably be a positive thing for him to go.