I remember a couple of other companies that did something like this with D20 Traveller and another with D20 Stargate that were both based on 3/3.5 rulesets. D20 Traveller had a few expansions, supplements, and adventures and then died off. D20 Stargate never really went anywhere but for a few supplements. Both settings had huge story potential. But sci-fi RPGs never seem to have much life in them save a few; RIFTS, Spacemaster, older flavors of Traveller, "add your own below". While many of them have been around a long time, they never seemed to have the popularity of fanasty settings. There just seems to be more of a market for fantasy. Feel free to speculate below...
James