Maya already has some sculpting features. It would be nice if these were as advanced as Mudbox or Zbrush. Blender has these features and I don't really see a reason to have it in a seperate program.
Also the possibilty to paint textures would be very nice. So often I just want to paint something up and to go to another software package, or photoshop is a bit silly. To be able to do it al in Maya would be amazing.