They won't ban MK. It wouldn't be a good business decision. They need those entrance fee's to make money, if they ban MK, They will not get as many players joining, because they main MK and put a lot of time into him. Plus, it is unprofessional to ban MK, cause it's like banning customers.
Also, there needs to be more neutral stages for more variety and more entertainment. It would look boring to be playing on the same stages all the time. Flat stage and platform stages are way too overused, and because of this, certain characters are better, Diddy Kong, Metaknight, Snake. The starter/neutral stage list should look like this:
Final Destination
Smashville
Battlefield
Castle Siege
Delfino Plaza
Pokemon Stadium 1
Lylat Cruise
Yoshi's Island Brawl
All of these should be put into random. These stages have no hazards that cause damage. Move able platforms are really no treat and they don't cause an unfair advantage. The transformation stages change form, so a certain character may have an advantage on that stage layout for a moment, but it won't last forever, since the stage changes every so often. Making it fair. Now the counterstages are questionable. It's going to be hard to please everybody on counter pick stages. We can't be playing on the same stages all the time though if we want Brawl to remain interesting and be kept on MLG for multiple years. It's time to evolve the stage rule set into something more diverse. Who here agree's with me?