Mario Vs Sonic Game

Instead of making those stupid Mario & Sonic at the Olympic Games's, why don't they make a Mario vs. Sonic game?


It could have several different stories:

Mario vs. Sonic (duh)
Luigi (or Wario) vs. Knuckles
Yoshi vs. Tails*
Wario vs. Shadow (?)
Silver/Metal Sonic vs. Kamek**
Bowser vs. Eggman

* I was thinking that sice Yoshis and Tails are both so innocent, that there would be one level where Yoshi fights Tails, and then Yoshi would fight Metal Sonic for the rest of his story.
** Can be omitted


I think that the final boss would be Bowser combined with Metal Sonic's parts and Eggman's technology, made giant by Kamek and using a powerful weapon powered by the Chrystal Stars and the Chaos Emeralds.

What do you guys think?