I love you, Dalek_Kolt, but that's such a flawed view on DLC. Have you been bitten one too many times by Capcom?
Anyway, you shouldn't let companies like Capcom and EA skew your view on DLC. Having DLC doesn't imply the game was flawed enough to patch, because that's what plain ol' patches are for. No game is going to be perfectly balanced, that's what balance patches are for. DLC should be legitimate extra content that COMPLIMENTS the game it's for, and Nintendo so far has proven that the DLC they've been doing is fun, reasonably priced and actual extra content for the game. In fact, Mario Golf is the first time they've utilized DLC in a way to add content in a way that compliments the main game. Best of all?
Mario Golf's DLC isn't on the cartridge.
Isn't it kinda funny that, when the fact that DLC isn't simply locked content that should have shipped unlocked with the main game in the first place, it becomes positive news? I find it funny.
So you can see why I'm confident that Smash 4 will receive DLC, and it's going to
GOOD DLC. It might even be like Mario Golf's DLC model: extra stages, and a new character bundled with the stages. That would be pretty dang cool!
tl;dr: DLC is great if it's not locked content, but is complimentary of the primary game.