As I've said before on another thread, I don't buy Superman as some lonely "last son" figure who can never really connect with humanity anymore, and that's exactly what Donner keeps trying to paint him as. It's completely valid in the movieverses where he's not with Lois and Pa Kent is dead and he's got no real friends, but in the comic continuity he has a loving beautiful wife, two live parents, a bunch of obnoxious "cousins," and a league of friends and allies who accept him as what he is and would cheerfully die fighting by his side. He's got more connections to humanity than most humans do, he doesn't all of a sudden need to raise a son in order to feel connected. In fact, Rucka implied in his arc that he didn't even really want a son.
Not that I would mind Lois and Clark having a son; I'd love it. But you've got to approach it correctly.