Yeah... See, giving a kid to Superman is kind of silly. DC comics isn't going to one day kill of Clark Kent for good and have his son take over. Same with Tim Drake becoming Batman. Sure, if DC progressed comics one day Tim would become Batman or something. But they won't.
I will say one thing. As I've caught up with a few noteworthy Superman titles I have noticed the reoccuring theme that Superman and Lois DO have sex. I don't think I've seen a bigger implied "Lois and Clark have sex" scene than what For Tomorrow showed. Not to mention Loeb implied it with one of his arcs in Superman/Batman. Would I want Superman and Lois to have a kid? You know I'm torn. I look at Batman and I say "Even though he's never going to age in the comics, really, I still in my little head hope that someone...maybe Tim or Dick, will become Batman when Bruce retires or dies." It makes me feel like the DCU is safe. So, yeah I could handle a Superman.
I wouldn't be surprised if some writers suddenly says "Oh, yeah..Clark and Lois had a kid al ong time ago, but it's been a secret" so they can have a new Superboy. Or they'll have a kid and name is Connor after Connor Kent.