So, basically, you're saying we cater to the people who wouldn't win tournaments with MK gone because they aren't at the level of M2K, Ally, ADHD, DEHF, NickRiddle, TKD, etc? Or am I misunderstanding?
I'm saying that we cater to
the community, not to M2K.
People forget that you can have the most competitively viable game in the world, but if no one
plays it, it's irrelevant. Ok, M2K is the top of the MK metagame right now. Good for him. If we cater to him, exclusively, then kiss Smash goodbye, because whether he, you, or anyone else likes it or not,
the 99% of people under him also give him 99% of the money he makes to travel.
On the same note, if you do everything you can to help out Joe Smasher who can't even make it out of pools, than the game stagnates and people stop playing it because it isn't a good game anymore (inb4Brawlisabadgamejohns).
Ultimately, though, M2K is one guy. M2K, Ally, and ADHD are three guys. The top 10 ranked Brawl players are still just 10 people. I'd love to see 10 players keep the entire US Smash scene alive all on their lonesome without everyone else feeding them pot money.
We gather data for the greatest common denominator because that's what keeps the community, and thus the game, alive. Alienate everyone at the exclusive benefit of the top players, and the game dies. Top players can go, and there will always be another to replace him; when the majority leaves, the top can't be sustained.
TL;DR: M2K is necessary, but he sure as hell isn't important.