Mario's biggest asset, which makes him special, has been his ability to produce big moments in big games. On average over a typical 90 mins, he's not especially good, but he does stuff at key moments in big games which often could & should decide them in our favour.
If he can get rid of the ability to attract refs, he can be the sort of player who wins title deciders and finals on a regular basis & that's what World class players do. If he can't stop taking cards however, we'll get rid.