Nintendo would make it into an action/platform game with simple RPG elements, though. That's their current trend.
Whether it would end up more like an X-Men game or FF12, there are things they could do to keep it interesting and intense. The problem, however, is that Nintendo does not make hardcore blockbuster titles anymore. Thus, the difficulty would be too low, the controls would be oversimplified, and the graphics would likely be less than inspiring.
Le sigh. Why did I buy a Wii again?