1. the games metagame is NOT even close to being fully developed. a melee AT was discovered like a month ago. melees been out for...8 years? probably more. and yet still AT's are still to be discovered. and brawls physic engines are WAY different the melee, so no AT's were transferred. sure theres a larger community, but its 8 years >>>>>>>>>>>> half a year
But there is also no imaginable AT that will give MK a problem, unless it's character specific. And the other characters aren't being used enough by the players who would be most likely to discover these things, because they're playing MK instead. Any general AT that gives others an edge will likely neutralize with MK being able to capitalize it just as well, unless it's something that relies on having a projectile (Which is again, pretty much character specific.)
2. If wario's CG works, then MK WILL have a bad matchup. NOBODY can argue that an one-mistake = 112% advantage can be good. and even if it doesnt work. most of his matchups at 60:40. thats very winnable.
If Wario's CG works, yes.
If. Bring this one up once it's been proven to work. And being winnable is irrelevent when there's no reason to pick anyone but MK. The ease of many of his victories seem to indicate the matchups aren't actually 60:40, I suspect the charts are just inaccurate on this and most are tipped more heavily towards MK.
3. somebody said something about no poor stages for MK. MK is a MELEE fighter. melee fighters generally dont have advantages/disadvantages on stages. MK's best stage is rainbow cruise because it focuses on aerial game, which is MK's bread on butter.
Other characters have bad stages. What this means is you can't even counterpick a stage against MK to pick up an advantage, so there's no way to push any of the even close to neutral matchups to advantages to you. So you may as well play MK, because that's the best matchup you're going to get. How is it not a problem when people have to switch to MK to beat him at times, because there is no other option or stage they can pick instead to gain the same kind of edge?
4. ahh, tourneys. MK dominates them. name one smasher that isnt M2K or Dojo that uses MK that consistently wins tourneys. if you cant, that means M2K and Dojo win the majority of MK wins, sprinkled with a minority of other MK players.
I don't know enough high level players to do this, so someone else will have to pick that one up. I doubt M2K and Dojo have gone to enough tournies to have accumulated nearly as many wins for MK as he's got though. You didn't actually demonstrate that MK didn't dominate by saying a scattering of people are winning with him. In fact, that points to him being too effective because he's causing problems for other non-MK players who could otherwise win. It would be stronger for your argument if people
could name just a few other really skilled players who are responsible for MK's wins, but the fact is people are picking him up and just thrashing others with him, causing those people to either switch or quit playing because they can't do a thing about it. That points to MK being too effective.
Now, my other points beyond responding to yours:
MK is driving players away from competitive smash. Why is the loss of players (Likely permanently, most people don't resume a hobby they've gotten bored of and found other things to do instead) not something to take action for?
How is banning a problem character such a terrible thing? If someone comes to a tournament and finds that their favorite stage that they always play on is banned, won't that make them quit? Why does this fact not matter, but addressing a character causing similar issues is a huge problem?
Why are you against even a temporary ban, to see if any other ATs that could allow people to combat Meta Knight emerge? If you're not against it, why haven't you mentioned it as an acceptable initial solution?