Nintendo is in a much better financial situation than Sony so it's doubtful they would become 3rd party in the foreseeable future.
They would make a good partner for Microsoft though as they dominate Japan where the Xbox brand is weak and together they would likely completely dominate North America and have a very large share in Europe. If they could come to some kind of financial agreement it would be glorious, I'd love to see what Nintendo could do with Kinect for example and they would have both basis covered in terms of core and casual and young and old.







