Getting this back on topic for a moment.... 2387 with Romulus gone and the Empire probably in shambles, and with Spock gone, and seemingly martyred for his cause, wouldn't this be a good time for the re-unification of Romulans and Vulcans to begin to rake place in earnest??
Some might think so, but I imagine it would meet with passionate resistance from the surviving Romulans. With their nation weakened, they'd be hostile to anything that seemed like an attempt to assimilate them back into Vulcan culture and eradicate their Romulan identity.
I'm not at all sure of that.
One thing that the novelverse has been consistent in doing, at least as early as Duane's Rihannsuverse novels, is establishing the Romulans as much more culturally diverse than an outsider might see. Duane established that the settlers of Romulus were divided into clans and even created small nations, these nations only being melded together by the Empire not destroyed. Romulan clans also functioned as independent blocs, each adopting different policies and in certain respects and environments (on distant colony worlds, say) acting as autonomous states within the Empire. Different worlds have different histories stemming from the period of their settlement: first-generation colony worlds, second-generation, conquered worlds, by a Ship Clan or by regular migrants or by ... ? The most recent Star Trek movie even establishes that there are three Romulan languages.
All these internal divisions have, in the filmed universe and in the novelverse, given rise to very substantial internal divisions, infighting, and even--depending on the status of The Empty Chair--explicit civil war. Charvanek did attack the Romulan flotilla destined for the attack on Narendra III, later using the attack to depose the sitting praetor. Romulans are divided.
We know that there's a reunification movement. We know that in the late 2360s it was not strong enough to pose a significant issue, if not an existential one, for the Romulan state, likely with different populations responding in different ways. If, as a result of a cataclysm, Romulus/Remus and perhaps other core worlds of the Romulan Star Empire were destroyed, I don't think that you would get a uniform reaction from the surviving Romulans. A "Time of Troubles" like that described in the Star Trek Online timeline seems plausible. If the surviving Romulans couldn't reunite, you might even see the Star Empire dissolve, some worlds and civilizations--including non-Romulan ones--opting for independence and others moving into a Federation orbit. Reunification just might work in that sort of desperate environment.