Don't think there is much change on a Soval/Erika-ship...
I know. It's impossible, it's illogical, and it has no grounding in anything, but it gives me paroxysms of giggles every time I think about it. I can't think of anything good to compare it too, other than the fabled Malcom/Lizzie ship, only with that extra degree of impossibility.
What I really want to know - and Rigil Kent will probably be po'ed with me for mentioning it again, as I've brought this up in several of my reveiws, but that was before I discovered this thread, so he'll have to bear with me - is when Trip and T'Pol rejoin Enterprise, as we now have definitive answers on both (see below).
"And she is alive," Daniels added suddenly. "You will see her again." Soval's lips tightened.
"And Commander Tucker?" he asked calmly. Daniels' mask of composure slipped as he smirked.
"Him too," the temporal agent said. "Where one goes, the other will follow. Think of them as a more intimate example of how Earth and Vulcan are … bonded together." Soval's nostrils flared as he struggled for control. No, T'Les was not going to approve in the slightest.
And from Chapter 49:
In the grand scheme of things, it didn't matter if T'Pol and Tucker were no longer a part of Enteprise's crew providing they were reintegrated into history at the appropriate fulcrum point prior to the destruction of Salem One.
Now, Salem One is only mentioned once as far as I've been able to discover in the franchise, in a deleted scene of TNG, and is one of the first battles/bloodbaths of the Romulan War, which starts roughly around where season 5 of ENT would've. Which means that somehow, someway, they find a way off of Ekosi at least 6 months before then. I say six months because, with the likely capabilities of a decades-old Orion ship and the likely desire for Starfleet to debreif the hell out of them once they ever get back to Earth, it'll take at least that long from the time they leave the planet before they'll be allowed to resume their postings.
Taking this into account, however, I believe that it'll have to be closer to a year before Salem One, because Daniels above indicates that they are important and nessicary to the timeline and, to be important and nessicary, you have to have gotten over some of the bound-to-be-lingering effects of being stranded on an alien planet for 1+ years, gotten back into the swing of things, and have people be used to your presence on a starship again so that they're not questioning your preparedness to be in a command position - which brings me to another point, you have to be fully reintegrated into the command structure of your ship, which is something Starfleet might be leery of doing right away if you're fresh out of such a high-stress situation. Especially in Rigil Kent's universe, in which the Starfleet/military tends to act more like a military probably would.
So I guess what I'm going with here is, what do people think? When are they going to escape Ekosi and rejoin Enterprise? 'Cause there's about a year-long window it could be now, which is rapidly shrinking if Future Guy is a future Romulan wanting to make trouble...