Melee at this point is an interesting beast at this point. I think the big thing is that it has an audience that's passionate enough about it to generate lots of money for it's FGC Scene, and that's why it will continue to shamble on, carrying a CRT TV in one hand and a gamecube controller with a manufacturing defect in the other. Even more funny is that Nintendo could actually nip the Melee community at the bud via sponsorship.
The only reason Street Fighter V is so prominent is because Capcom continues to make that game the gravy train, even if everyone playing the game hates it because the balance in that game is boreked in a way that basically allows you to make absurd comebacks in matches for very little effort.