The ease of modding this game makes it infinitely replayable. I'm lucky enough to have still-registered copies of EVC (Escape Velocity Classic) and EVO running on a virtual Mac OS 9. Yes, if you own EVN, you can mod into EVC and EVO, but you can't then run the mods (plugins) on the modded version of the game with a few exceptions.
I'm sure that if this game came to GOG, some old plug-in authors might update their mods for the game to work, or that a dedicated fan of a given plug-in might modify it. Or maybe someone will create a whole new plug-in that becomes a favorite.
As abandonware, this would absolutely be a great game for GOG to add. So would EV Classic. I'm less hyped on Nova, as the story isn't as good, but the modding community would be great I'm sure.