How the Romulans and Romulus Went Out in and After Nemesis, So Many Problems

[Timo]

...Perhaps it facilitated a glorious return to the Promised Land after millennia of diaspora? Vulcan might have decided it no longer needed Vulcans offworld now that the Federation was buffering the threats, be they military, commercial or cultural.

Timo Saloniemi

 

[eyeresist]

We didn't really know whether Vulcan had an empire (Vulcania?) until the 2009 movie. In retrospect, it's a good thing there never was an unambiguous reference to a Vulcan colony world - the closest thing is the Vulcanis Lunar Colony, birthplace of Tuvok, quite possibly located on Earth's own Luna...

Yes, I don't recall mention of Vulcan colonies, but in ENT there was an ongoing territorial (i.e. spatial) dispute with Andoria. Vulcans had a listening post at P'Jem (the name of the outpost; I don't think the planet was ever named), and annexed a border planet (Paan Mokar) which had been colonised by Andoria.
P'Jem was officially a place of spiritual retreat, which suggests other planets than Vulcan were used for such things. Also, I think it's reasonable to speculate that defacto colonies would arise as a result of mining operations, trade outposts, military outposts and science research stations.

Regardless of what Abrams' did, it has little bearing on what Spock was trying to do in TNG. Nemesis pretty much undid it by killing the entire Romulan government anyway.

The ruling council was assassinated, but we are led to believe coups were quite common on Romulus anyway.