Actually, I thought Singer had planned with this story to "free" Superman of the constraints of a relationship with Lois, at least that was what I thought before seeing the film and discovering that they now have a child.
I really liked the idea of a single Superman without the love angle, without having to be with Lois, married or otherwise -- I think the whole Clark and Lois relationship is pretty boring and limits the Superman story.
Keeping Clark and Lois as competitive colleagues seemed to me more fun, like in the old George Reeves series. I think the comics have suffered from Clark and Lois being married over the past decade (I actually thought this would be fixed by the recent Crisis, but no luck).
I like the idea of Lois being with someone else, even if it's with Supe's child. Not all relationships are meant to be and the whole Lois and Clark romance is, in the end, a direct result of the corny Lois and Clark TV show from the early '90s and that's no real reason for Singer or any other filmmaker to follow that continuity.
It really shows how fans can be so easily manipulated -- a TV series-comic tie-in has, in the past decade, become canon in the Superman mythos. Why?
Does Luthoer now have to be a young good-looking guy who used to be Clark's best friend from Smallville? Of course not.
Time to re-write the canon, I say!