I just wanted to mention something about the Mario franchise debate a while back. Basically, even though DK and Wario have their own games and series now, it doesn't also mean that they don't belong to the Mario series (although DK I don't think I've seen DK in a Mario game for a while...I honestly don't know much about Mario games). I mean, Luigi has his own game/series, but he's still a Mario character. Likewise, Tingle even has his own freaking game, but he's still part of the Zelda series.
Bringing me to my next point. The Zelda series has been around almost as long as the Mario series and earns Nintendo almost as much money. Pokemon hasn't been around quite as long, but it too earns Nintendo about as much money. Both of these series have four characters (well, more if you count transformations). However, the Mario series already has 8 characters. I really doubt we'll be seeing any more Mario characters, especially ones that haven't done anything significant recently (Toad, Bowser Jr.).