Unfortunately, I doubt this will ever happen. It won't be seen on a Nintendo console because of Sony and it won't be seen on a Sony console because of Nintendo. While the thought of it could make it an amazing game, it's just not something that will ever become a reality. Maybe it could happen if Nintendo and Sony didn't go sour back in the 1990s. Even if it did happen, I don't think most Nintendo players would be familiar with Sony characters and Sony players being familiar with Nintendo characters unless they play both systems.