To be quite honest, I think JFox, while right about several things, is a little off. Melee won't die, not as long as there are still people who resent brawl. And with every day, more and more melee vets are realizing that brawl sucks. The brawl scene is dominated by complete nobodies right now (by "dominated" I mean in terms of the ratio of good players to nubs). The entire brawl scene is being fueled by nubs right now, players who never were competitive in melee in the first place.
The only reason the pros are gravitating toward brawl is to make some easy cash, as has already been said. Now, melee will die if we let it. However, if melee tournies continue existing, there's still a reason for pros to continue playing melee, which gives the other players reason to continue trying to get better and beat them. It's a cycle that feeds upon itself. This cycle has stagnated with brawl's release, however, if we continue feeding into it, it will restart. I know few if any people who enjoyed melee before that enjoy brawl more now. These people, those who enjoy melee more, are the people who will continue to support melee's community. Players will continue to improve, and new faces will indeed start showing up in the top placements at tournies. Although some players will not return, and although they will be missed, the only way melee can die is if we let it.
Eventually, what will happen will be that brawl levels out to a much lower level of participation than its current hype. The hardcore brawlers will likely continue having tournies, while all the nubs eventually quit. The fact that brawl and melee are two very different games that draw in two very different types of people is what will allow both to coexist. Players who enjoyed melee more will naturally gravitate toward the melee tournaments. Players who like brawl more will stick with it. It depends entirely upon what style of game they prefer. But in few situations do the two groups overlap (at least as far as taking the game far enough to be competitive, anyway). This is how melee tournies can still prosper. This is how the game can continue existing long after brawl's release.
We can do it. We can keep melee alive. But we need to actually try. Just giving in to the majority and playing brawl because everyone else is won't do a thing. I urge everyone to try to at least get their local tourney hotspots to host both melee and brawl tournies, if they aren't already. Talk to smashers you know who used to play melee about getting back into the game. Remember, the brawl community is only as large as it is because of the huge surge of new players. All the melee vets are still around. Some have moved on, but with little encouragement, I think most would be more than willing and happy to participate in melee tournies, or a melee smashfest. At least that's been the pattern in the people I've talked to.
Keep the community alive. Keep melee alive.