If there were Romulan colonies wouldn't the supernova take out a bunch of them as well?
The problem with that is that the Romulan Star Empire circa the late 24th century is a vast polity. Maps from
Star Trek Star Charts are available
here.
Basically, in the case of a supernova explosion threatening the galaxy going off near Romulus and expanding to consume the entire Star Empire, you'll also have destroyed all of the core worlds of the United Federation of Planets, including Earth, Vulcan, and I'm pretty sure also Deneva and Vega. If
that happened, then Spock's exclusive focus on the destruction visited on the single heavily populated world of Romulus seems unusual. Why wouldn't he have mentioned that Earth, too, was consumed by Hobus?
Robert Orci can say whatever he likes but if it ain't on the screen, it doesn't count. I remember reading a chat transcript at Trekmovie when he said that they moved Delta Vega. Dumb idea but does that mean we have to listen to him about that as well?
Why not?
Besides, why would Spock belive himself to be a member of an endangerd species if of ther Vulcan colonies still exist?
Spock was in shock after the annihilation of his homeworld and the death of his mother who fell to her death just as they were on the brink of being rescued as their fingertips touched. A few hours later, after trying to choke Kirk on the bridge of the
Enterprise as everyone watched in horror, he then made out with Uhura on the transporter pad before beaming over to the
Narada. His objectivity at the time, based on what happened and based on his behaviour, is quite open to question.
One problem with disputes over canon like this is that it is terribly easy to adopt overly literal interpretations of statements without reference to the plausibility of the statements, the likelihood of the speaker(s) being unbiased observers with full knowledge of what happened, etc, these questionable literal interpretations in turn being identified as the only possibilities.
A very strong indication that Spock was wrong lies in the fact that dozens of light years away on the planet Romulus (and likely many others), billions of people descended from migrants from Vulcan who emigrated to try to preserve an idealized version of Vulcan and speak languages similar to standard Vulcan and who are interfertile with Vulcans still thrive. The cultural grouping of "Vulcan" might be threatened, but the Vulcanoid species is not.
And why would Spock Prime have to find a suitable planet for the 10,000 if there's already colonies in place? "You just lost you planet? We're going to drop you here and have you make a new start rather than letting you go to Surak IV where they have a nice colony already in place." 10,000 people isn't that much when added to an existing colony.
That's actually a good point.
Perhaps if there is a cultural disinclination towards extraplanetary colonization everywhere, it is not so much Vulcan
oid as simply Vulcan. Every colonial empire of any duration I can think of has had, along with subjugated native populations, very substantial migrations of citizens from the core territories to the newly conquered peripheries.
Back to the Romulans.
Many Romulan colonizable worlds will be uninhabited or only thinly inhabited, ready to become Romulan colonies. Many colonizable worlds will already be densely populated, having relatively smaller Romulan populations, whether a thin patina of rulers or a large body of Romulan settlers functionally similar to South African whites under apartheid. With the Romulans' aggressively expansionistic attitude and territorialism, the idea that there wouldn't be plenty of Romulan colonists ready to leave the adopted homeworld and pioneer empty worlds and migrate to peopled ones over any number of centuries just isn't plausible.
