They were good, but not necessary. Wario would be good, as long as he wasn't a clone.
...I want more bombs. Sorry, it's just that I like it when my enemy has about 200% and won't die, and I pick up a Bob-Omb and he instantly flies off the top of the screen.
How about a Mushroom Kingdom III?
I hope they don't put more Earthbound characters. How good do YOU think it'll sound when the announcer shouts "This game's winner is... POO!" >_<