I think Atlantis was more often compared to Deep Space Nine, no? And, anyway, the comparison there doesn't really hold. Atlantis has been it's own thing, with it's own virtues and own set of problems. And of course this nickname has been used since the first news leaked out--really, plot wise, it's the only news that's leaked out. A ship. Cut off from home. In a distant part of the universe. The third (modern) permutation of a science fiction franchise. Hmm...what does that sound like? We honestly haven't learned anything about the series since that piece of information came out. Brad Wright saying Stargate could go on forever or mentioning that Universe is being made with a younger audience in mind doesn't really tell us a lot. Until we have more to go on, Stargate: Voyager will do just as well as an admittedly snarky nickname. Like Fargate before it, the name will probably be dropped once the show is out.