I'm pretty content with the roster. Its just how they marketed the newcomers that bugs me. If they had instead made the veteran characters unlockable, and the newcomers the secrets, that would have made more people happy. In this case though, they made SSE the way it is and as a result, we have so many newcomers being starters. In turn, controversy is what keeps this game selling and no matter what you will say, people are still going to buy this game.
However, if Miyamoto does plan to make another Super Smash Bros. game, he better be planning how long the development team is going to take and not tell the public until like 10 years from now. He also better have told people that this game has been in development for a while so our next new roster will be over 40. Like the guy above said, it takes a month to make just ONE character. By having 21 veterans being graphically enhanced, thats a few weeks already. Along tweaking with the clones, thats another few more weeks. Now here is the tricky part, the newcomers. There is PK Trainer (who counts as three), Pikmin & Olimar, Wario, Meta Knight, King Dedede, Zero Suit Samus, Pit, Ike, Diddy Kong, Lucario (not really considering his moveset is likely a major tweaking of Mewtwo's), Robot, Snake, and Sonic. That's a year and a month with newcomers. Also, the rumor with Geno (It would take a month and a half taking him in and out). So there we go.
My expectations for SSB4 are now crafted from Brawl. I can't wait to play Brawl to get me over the decade long probable wait for SSB4 if they decide to make another one.