I guess he does have a point. Having Snake in SSB4 would be more reasonable if Snake had a stronger presence in the Nintendo universe; the game is about Nintendo characters beating the ♥♥♥♥ outta each other, and Snake doesn't come off as a Nintendo character (as opposed to Sonic, who actually had a history with Nintendo, as far as I know). Granted, Ness and Captain Falcon haven't had a game in years, but they're still more Nintendo than Snake.
If the roster was guaranteed to be at least as large as Brawl's, I'd have no problem adding Snake to the list. There's little competition for space with a roster that large. But if its not that big, I'd rather see Nintendo newcomers in the empty spaces.
And when the hell are they gonna reveal more of the roster? It's still bugging me a bit who the other Fire Emblem rep(s) are gonna be...