Nintendo + Sony should collaborate together IMO. It would create a stronger single entity to battle the onslaught of more and more gamers get hooked on tablet/cell phone gaming and the general erosion of the business.
Now that Sony's president is Kaz (a video game guy), Nintendo can talk shop with him directly I think.
Also perhaps make it a wider deal where Sony distributes Nintendo based movies, animated shows, etc.
I really don't see why an animated "Nintendo Movie" couldn't do similar business to the LEGO Movie or Wreck It Ralph if given to a good writing team.
Try it for 5 years, see how it goes, IMO both companies will be happy by the end of the 5 year period.