You still have yet to provide me with an example of your ban criteria. Until you do, stop harping on the anti-ban side about how bad their arguments are. They're still miles above any points made by pro-ban.Man people are trying really really hard to defend MK and they're providing less and less justification.
See what I did there?
Which is also stupid. We don't ban characters because "It would be more fun without them". We ban characters because they negatively effect the metagame and overcentralize to the point of ridiculousness.This is another form of slippery slope argument, and it's entirely unjustified.
You have no evidence whatsoever that people would just "forget" how to fight him - heck, part of at least one anti-ban argument is "People don't know how to fight MK so that's why they want him banned." If they already don't know, how will they know even less so that they'll want the ban put in place permanently?
Now, more reasonable might be if you said it this way:
Then Meta Knight comes back, everyone has forgotten how annoying it was to play against him, and the ban is sealed completely because they had more fun when he wasn't allowed.
Is that true? Well, all the banned MK tournaments have had reports of how much people enjoyed not having to face MK. To see if it holds true would require actually banning him temporarily and seeing what the longer term (ie, more than one tournament in a row) results are.
Less fun is not a warrant for banning.