All you really need for the Wii U to sell units is to use it for games similar to tabletop gaming. Rather than having a board on the table, you have it on a screen, and the Games Master uses the controls the game using the game pad. They can update the game by setting traps if the team are doing well, or aid the team if they are in trouble. Converse to traditional table top games I've played (Which isn't many to be fair), most of the preparation is done prior to playing, so the ability to have the game be electronic, and therefore more fluid, sounds like an amazing way to move units.

Crimson Shroud does this on the 3DS, but the issue is that's one player. Not the way that this game should be played.

That and I don't believe it would be so hard to make new games in that genre.