The Romulans are IMHO happiest right now: Vulcan gone, gone, gone (served them right for not being militaristic enough and not having strong defenses!), the Klingons lost an armada, right and that Federation has also lost a good number of ships and many people. The Federations is probably looking to do peace talks &ndash alliance with the Klingons, to defend against Romulus? Or talk with Romulus? There's still the problem with their star... Maybe Spock Prime is pushing for reunification efforts, as that would be a way to reunite their culture and resources. I don't much see what the Romulans would get out of it, though &ndash better science? Hm.

Adding in a vote for the Organians. Another interesting possibility: if Vulcans are really that endangered now, would that alert the Preservers? Do they even still exist?

And other menaces: 1) the Tholians are still out there, possibly expanding their territory. I think the Enterprise first encountered them, right? So in this 'verse, they don't know about them yet unless Spock Prime tells all. 2) the Kelvans! They're going to come in and scout for settlement territories and unless Spock Prime tells anyone, the Enterprise won't be present to deter them. That's not for some years, though... I think, for now Organians or Preservers or the usual Romulans and Klingons might be the best bet.