You know, I wonder if there is any connection between the Illuminati information broker group that appeared in Sword of Sedition and Fortress Republic, and Comstar/ROM. Comstar really just does not have the base to be a power; it only survived as an independent entity into the Dark Ages because Devlin Stone allowed them to hunker down in the Republic and convinced the other states to allow them to maintain the HPGs. By 3132, they've become nothing more than a huge interstellar company rather than a political power (I doubt interdiction threats would ever work anymore) that has its HQ on Terra. Yes, there is a secret faction within Comstar trying to return it to what it once was, but as seen in Bonfire of Worlds, the Republic can handle them pretty quickly. At this point, what is Comstar just completely becomes an intelligence brokerage firm, ala the Illuminati company? When the HPGs all worked they had all that information to access.
I think it is more likely Comstar will fade to nothingness following the IlClan or will evolve into the secretive information group. The time of them being an independent power with their own military is largely passed.