He is more broken in doubles, considering MK + someone is always a team, if not double MK. I haven't gotten a full chart yet, but I'm working on it.
Well it sucks, but Akuma mains, Kiba mains, Ivan Ooze mains lol, all have to deal with it if it happens. Let's face it, they full well knew they picked up a character that is considered borderline banable, they can;t have not known the risk. There isn't a way they couldn't have known that.
Banning him can also increase attendance, and bring more people back. There are pros and cons, alongs with risks. People who have looked at the issue know this, same thing when other characters, card etc. have been banned in a competitive setting, it's normal.
Banning him isn't going to destroy the competitive scene when keeping him legal seems to do just that as well.