I agree with what praxis is saying.
Honestly.... most of you aren't at a level or aren't familiar with high-level brawl play to be talking about mk's ban-worthiness even some people in the SBR aren't qualified
The few videos on youtube are like 5% of what's really happening at top levels
the best legitimate reason behind banning mk is that he destroys the cp system, which is true and a good reason to ban a character when your fighter revolves around a counterpick system. he's beatable as are all 60:40's but as you get closer to the highest levels of play the 60:40 actually comes into effect (as in, you play near perfectly and you still lose).
The ONLY characters that legitimately go close to even against top mk's are campy warios and campy falcos. Tournament results back this up. For people like fiction that say just learn the matchup, you think other top players of their character haven't studied and practiced the **** out of this matchup? it lets you beat ALMOST all mk's, but that's not good enough.
Every other character has a worse than 40-60 record across the board and among top players (I haven't actually looked up the numbers but I'm willing to bet money), suggesting that mk is easier to play consistently at a high level or that some of these 60-40 matchups are actually worse (most likely a combination but more heavily on the former).
Basically what i'm saying is... there is really no harm in a temporary ban. Top players will develop other characters, which other good players will copy. Or they'll quit, which is sad but really smash isn't going to slow down cause of that. If the game becomes more campy (because of the elimination of one of the most offensive character in the game), or someone ends up dominating, then go back to having mk.
There needs to be a big tournament with mk banned. No one's speculations are more valid than another until they have results to back them up. So far I think hobo is the biggest tournament to have mk banned, and after going to texas, i can tell you most of them don't even play mk anyway. A large EC or WC tourney where everyone has a mk as a secondary would shed more light on the consequences of banning mk.
Edit: there's a few flaws in my statements but i'd like to believe my main points are strong and valid.