Nintendo should keep Mario a platformer, and Zelda a 3D RPGish game

I don't mind getting a lot of the TRUE games in the series' because they are all good, but slapping Mario and Link's name on every title that comes out for marketing purposes is annoying.
-EDIT-
And changing up an already perfect formula is annoying too. Some of us just want more of the same. Improve the gameplay, but don't change how the game is played. (if that makes any sense... think Mario 64 vs Mario Sunshine)