Actually...while I haven't read it myself yet, one of the newer novels is set in an alternate universe where it does happen. (Myriad, I think?)
Yeah, I was surprised when I heard too. The Pocketbook writers have been throwing the J/C fans a few bones here and there lately, though. Aside from some throwaway lines that hint at more in some of the recent books, they also had a rather interesting storyline in one of the Mirror Universe, and one of the stories in Distant Shores was all about their relationship.
Well if they start doing more with this alternate universe I'll have to start buying Pocket books again. It sounds a hell of a lot better than what they've been doing in the "real" universe.