^^well, not really...did you see the HOBO 16 results? xD So many meta mains got good placings, without meta. That's total proof that they have mad skills and can pull off wins without MK just as easily, if they played with them as much as they play with MK.
I am for the metaban, personally, or at LEAST a soft ban. The results would be much more interesting, as well as the matches, and no one who had much more skill than a MK noob in a tourney match and lost anyway will ever have to live through that frustration ever again. Also, it won't affect the outcome for the MK mains out there all that much. They'll still get their deserved place just as often, if they can prove their worth with any other character.
If he has no bad matchups or stages, and if you go to any tourney you see them everywhere, then why doesn't everyone play with MK in the first place? Sadly, I think that might be what it will have to come to before SBR decides to ban him.