Elmofongo: I would be surprised if GOG revives old MMORPGs like Ultima Online and Everquest 1 with GOG supported servers :)
Nirth: Why would they? Unless the games have a supported in-game server support I don't see that happening (and for good reason).
Besides, I believe both games are still running and worst case, there are private servers.
The only way I see GOG "resurrecting" MMOGs (or MUDs) is to include the server component (whether original or third-party, as allowed by the relevant rights-holders) in the installer package so that the customers could easily set up their own private server. Otherwise, GOG-run servers could easily be called out as being DRM, and said servers being shut down sometime in the future would again shut people off from playing the game legally.