I think competitive TF2's biggest issue is how okay it is with slowly bleeding out. there's a lot of excuses being made that are trying to skirt around the bigger issue, that issue being that beyond a handful of important players, players don't want to help support all that much. for'real, y'all genuinely believe the ruleset a bunch of dudes built out of trial-and-error for a decade is more popular than any other form of melee, a game that sold 7 million copies? don't be ridiculous, in the grand scheme of things melee's competitive play was quite tiny, but community leaders were stubborn about keeping their support. you don't get that breast cancer drive loaded without a strong core, after all.
one of the most depressing things I saw from this community so far was in the thread regarding lange, where players just kind of assumed people would come to these communities naturally by virtue of them existing, and there's no reason to ever care otherwise. do you realize the implications of those statements, how incredibly bad that looks for anyone who cares about helping? that's pretty saddening to see, I'd say.
going back to that cancer drive for a moment. one incredibly important factor in melee winning that came from bobby scarnewman (dude who now works at twitch, PeoplesChamp etc). people like him, and prog, and so many of the top players for melee poured their heart and soul into making everyone watch his stream and prepare for a massive outpour on the final day. I remember trying not to scream in the middle of the night when it was announced melee won that, and just thinking internally, "holy shit, imagine the things our community can do when we put our effort together like this!".
and then everything else in 2013 and beyond happened because of this, and that was that. this is a really important factor that smash as a community has, and you can see it everywhere. do what you can, promote tournaments that are happening, teach people about the game, talk and discuss with others publicly. maybe the dude who talks about tournaments all the time on twitter isn't on the level of someone like prog and d1, a commentary duo that introduced so many new players into the depth of the game, but any support is good support, and he's giving it out.
see that "comp.tf" tag people've been rocking recently? that might not make you lange, or tagg or cbear or admirable. but there's an important, notable chance that you might get a good pub player to ask your about it, and you can help them, and that is exactly one more person who is in this community than before. you do not believe how much that can add up over time. it's small, but it can work, because even a slight hint of effort can take you god damn everywhere.
one more point I want to make, when regarding smash: officially, nintendo did not officially acknowledge smash's competitive scene until earlier this summer. that's about a year and a half past the ball starting to roll, a year and a half after we started to get noticed on a large scale. official support's nice, but it doesn't beat a mass community effort, no matter what.
source: am smash player
not very GOOD, mind, but I know enough about what I'm in to explain