This is a bad idea.
The idea of "settling this issue once and for all" is a bad idea, period. We don't know what will happen in the future, if he's banworthy now, and metagame advances change that, then we need to be able to unban.
Conversely, if he isn't banworthy now, metagame advances may change that in the future, rending him worthy to ban. If we say, "this is it", then taking it back later hurts the SBR's legitimacy, but not taking it back later may do a great deal of damage to the metagame.
And honestly, even for the current metagame, he MIGHT be bannable, but we don't really have the evidence to decide this, which is another reason why this is a bad idea right now.
Match-ups? Unreliable theory behind them as I've said many times before, nobody seems to know how to properly deal with mindgames potential (where we basically have the polar opposites between "everything hits" ala "Ike f-smash", or "nothing hits" ala "MK will always be able to maintain those 5 pixels that separate the range of his d-tilt and the range of snake's grenades" whereas the correct answer is talk about odds of a correct prediction and damage that a correct prediction does). Match-up theory needs to be radically re-examined before we can even talk about banning a character.
What about empirical match-ups? Unfortunately, there's not enough collected data to really talk about this.
How about tournament results? Well Ankoku's thread helps there, because it basically measurs centralization, but it doesn't measure character power in the metagame, because of this it's far too influenced by popularity to be the only measure.
I'm
trying to address this, but we haven't even really gotten a list up because it's still be organized.
It's still too soon for this, I talked about this
in a blog a while back, what we should do in order to decide this, and really, none of the objectives have been met.
We see tournament results in terms of actual centralization, but unfortunately that's only a very tiny portion of the picture. Rather then doing this right now, we as a community should concentrate on actually preparing for this as a concerted effort. Not twiddling our thumbs and reposting this topic everytime a lot of MKs place well, and certainly not choosing a random time to "decide it all" with no real data to back it up.
As a final note, HD remix Akuma, I was under the impression that he's actually a great deal better then MK and one of the main reasons he was banned was because he has literally inescapable set-ups as well as various other powerful options that places him FAR above the rest of the cast, whereas our data indicates mainly 60-40s for MK.