Watching SR the other day I was thinking how dramatic it would be to try to squeeze in Superman's return to earth by his falling to earth from the ending / hospital sequence. The main problem would be Supes finding out about his son... which may be something that may just click with him later... and how to end the movie without the falling / hospital stuff. *shrugs*

Just thought I would pass on the idea. On the surface it sounds like an unrealistic idea, but no more than Superman finding / making a spaceship from a desolated planet to get back home.