IMO, popularity is not a legit reason for a ban.
His popularity is more of a result of how good he is than a reason to ban him.
Sorry, but if we're to continue to ban Smash Balls, items, and some stages, then a Meta Knight ban is a perfectly acceptable thing to talk about.
What it comes down to is this: he is the answer to every problem you could possibly have, which is imbalanced, and not just a little, but heavily. If he was eliminated, we'd have a situation similar to the one we had in melee, where the top 5-6 characters (in this case, 10-15 characters) would go well enough against each other. Whether or not you think that's a good enough reason for a ban is what this comes down to. I do. Half the community at least does. Hell, even Play to Win, the competition bible does. Ever read the subject on bans? MK fits
perfectly.
Now I'm not totally unreasonable so I'll level with you: a lot of what I just said isn't "technically" logical. Appeals to popularity and authority, etc. But what we have here is a community that has made several
illogical concessions to better foster a competitive environment. Why? Because we recognize that the game we play is not fit for competition without changes to the way it's played by party-goers and casuals.
Characters are not sacred things. It doesn't matter how many people are playing the game. It doesn't matter how many people are playing Meta Knight. If items and stages are fair game, so are characters. The second you stop thinking about characters as being things that need to be preserved unless absolutely necessary (and I'm sure the only time you'd be for a ban was if MK was Akuma level or crashed the game when loading it) then you start to see where we're coming from. He's not important. He's a detriment.
And hell, we have more than a bunch of whining complaining scrubs anyway. We have pro players like Snakeee coming out in support for at least a temporary ban. We have at least part of the SBR in support as well. We have data supporting it, too, such as overwhelmingly one-sided tournament results across the board. This isn't just a parade of whining, no matter how much
baloney you spew forth while pretending we're all just *****ing for the sake of it.