Woah hold your horses! That train level was the best part of the game together with Glitzville.
What I want Nintendo to do is give Intelligent System's enough resources for a true sequel for Paper Mario 64 and TTYD. GamePad could find a lot of brilliant uses in Paper Mario. Exploring the franchise a bit won't hurt anybody (except some feelings when you fail to communicate the key differences of this particular game) but a game should never forget its roots.
Running back and forth on the train hoping to find the right room to move the story along? no thanks.
I would absolutely love a proper Wii U Paper Mario. I think it's time after two spin off games.