Well, then I guess it'll still be a surprise for you.
I was also gunning for a divided Romulus at the time of the nova. Having a single Empire (and a moderately led one, at that) doesn't seem as interesting to see go foom.
This is a slight aside, but has anyone ever discussed the possibility that the nova was the inciting incident for the Klingons conquering the Romulans in the "All Good Things" future? I mean, all things being equal, if the nova was a natural event, then it'd happen in all of the various alternate Trek timelines.
It's a cool idea, but Romulus is mentioned by name in the "All Good Things" alternate future. Maybe Spock launched in time, or maybe the supernova (which may well have been unnatural - just look at "The Q and the Grey") never happened.
For those interested, The Needs of the Many technobabbles the hell of of the Hobus supernova. Short answer: 20 years later, they still don't really know what happened.
One problem is that the names of some species' homeworlds--"Romulus" and "Cardassia" come to mind--are frequently used as names for the wider civilizations rooted on those homeworlds. When Garak talks about Cardassia, he's talking as much about Cardassian civilization as the actual planet of Cardassia.
At this stage, speculation is sterile. IMHO.