Then we would either complain that he should take it off or just go meh. Nothing would have changed. He actually hated the mask (hard to breath in, that is why they kept changing it). The mask had no super powers or anything like that. Guys like mysterio need to keep their mask, guys like Kane not so much. Kane actually vetoed a lot of title wins because he always like putting people over more (kind of like Owen Hart). He was actually supposed to beat Taker at Mania (1st time, Taker wanted him to win), but even then he said no.