People are missing almost the entire point for some reason...
It doesn't matter whether or not Metaknight is difficult to play or not as long as he is within the possibilities of human finger and mind capabilities it doesn't matter at all. The fact is he is the dominating character.
Many pros are ditching their characters to play Metaknight, and are consistently doing much, much better. I think a decent point was brought up recently by Mikehaggar, that if other pros can get at least 3rd place with other characters it means that Metaknight isn't leaps and bounds higher than everyone else. Though I agree with this I still see Metaknight as a banable character.
Sheik never dominated tournaments like Metaknight has. Metaknight wins 70%-80% of all tournaments. Shiek has NEVER seen such numbers...
Sheik also has SEVERAL counters, even early game she had counters and problems with other characters.
I agree that people who practiced a character and having that character being banned would suck. However, people act like their time was wasted. In the process you were learning Mindgames, the physics of brawl, tech skill, and possibly making money. You should be able to play another character in a week or two. If you can't, maybe Metaknight is even more broken than I give him credit for.
People really need to stop using the stupid excuse "Wow, you guys are just lazy just play the game more and find out how to beat Metaknight" and the other one "The creators of the game wouldn't make such an unbalanced character". The first one is just arrogant and there's a lot of tournament data that directly goes against what you are saying.
Also people bring up popularity with almost no idea as to why it's being talked about.
Here is an example. If Metaknight wasn't popular, as in he is only played by 1/40 people. This gives people going to a tournament the ability to play other characters other than Metaknight, and if lucky enough maybe never play him. That allows other characters to flourish. His popularity has also sky rocketed his Metagame much quicker than other characters, just like what happened with Snake. The only problem is Snake's game has stagnanted much quicker than that of Metaknight's.
Yes, Metaknight is popular because he is good. All I'm saying is that because he is popular you can guarantee that you are going to be fighting Metaknights in the tournament you're going to.
Ice Climbers are a great character in Melee, however I have never actually fought them in a tournament... Lucky too because I don't know how to fight them effectively (for that reason too).
The actual question being asked here is simple.
Is Metaknight destroying Brawl? I think the answer is yes. Yeah, if people wanted to everyone could just pick up Metaknight. That sounds fun. For Brawl to be a flourishing game it still has to warrant fun, if it doesn't do that than there is no point in playing it. Being able to use other characters is more fun.
Other character give more variety to a game. Other characters are sometimes played better by people simply by the way they think. With Metaknight gone, all of the other characters left still have counters.
Will there still be a heavily Tier'd system? Yes, but at least openings for other characters in the tournament scene exists.