On other Starcraft forums and to a limited degree on Battle.net itself, there are some people (probably the hardest-core Raynor/Kerrigan supporters) who think the two of them ought to have a kid now that Kerrigan has been de-infested (or "fumigated," as someone cleverly called it). At least one person said this hypothetical kid would play some kind of messianic role in defeating the Dark Voice.
Is it just me, or would that be a really bad idea, both logically-speaking and story-wise?
Several reasons:
1. They're not married. Moral considerations aside, it would also be out-of-character for Raynor. Little Johnny Raynor (Raynor's son who died in what was in all likelihood the Ghost program, mentioned in the novel Liberty's Crusade
2. If they were ever officially a couple prior to New Gettysburg, it wasn't that long. Rushing into things of this nature is a very bad idea. Especially since going back to the way things were before Kerrigan was captured by the Zerg at New Gettysburg would be impossible (see below).
3. One word: Fenix. That's a really big elephant in the room. Plus, if something resembling Kerrigan's human personality is in charge post-deinfestation, she's going to be a mess. She felt bad about calling the Zerg to attack the Confederates at Antiga Prime and objected strongly to Mengsk calling a much large group of Zerg in to attack the Confederate capital of Tarsonis. She's going to look at what she did as the Queen of Blades and be thoroughly horrified. I imagine Raynor would be willing to be try to work this out, but still.
(And the "Queen of Blades" is in my opinion Kerrigan's unrestrained dark side, not some usurper entity using her body. Some aspect of the Queen was always there and will always be there--and it might well be stronger than it was before.)
4. They both have more important things to do right now. Mengsk is still on the throne (and due to the revelations about Tarsonis, he's probably weakened enough to kick off it) and the first Hybrids have already arrived in the Sector. The End of Days is coming and it's coming soon.
5. Per my comment about coming soon, there won't be time for some red-headed telepathic redneck to become the Savior of the Sector.
6. Pregnancy would sideline Kerrigan, who (assuming she's on the side of the angels again) would be one of their most powerful fighters, at least in its later phases.
7. Both characters are intelligent enough to realize how tremendously impractical this would be.
Now, I did make comments in my earlier posts on Starcraft 2
However, that's for later, as in, after Mengsk is overthrown and the Dark Voice and its army of Protoss-Zerg hybrids is defeated. Right now, there's a war on.