No, this is a very interesting idea. It's just a shame that Alderac entertainment lost the rights to the franchise (although there is a fan made Stargarte Atlantis book out there somewhere). Oh, and don't worry about SGU: we here in the states only have 10 more episodes left in the "reality show disguised as science fiction".
The think I loved about SG:A was that this was a totally new universe..er galaxy. There was very little crossover with the previous show. The Wraith were great badguys; arrogant, cruel, powerful and very capable. Would have liked to see a few more wraith have more than a nameless part, but that also made them kinda scarier. We were a prey animal, not worthy of anything other than feeding. In the early episodes, they were almost unstopable, but by the end, they were getting killed by small arms fire.
Another complaint of mine about the series was they very quickly established a way to get more supplies/people/support to the City. And they seemed to not explore much after the 3rd season, including the city itself. The Pegasas galaxy had all sorts of mysteries, it was a shame it turned into a typical sci-fi action show.
Somewhere on Gateworld's message board, is a thread I started, with was basicly "Season 6; you make the episodes", which was very fun to write. I may have to see if I can find it and link it here.
Or not.
But seriously, you should do your campaign.
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"Yes, it's the Apocalypse alright. I always thought I'd have a hand in it"
Professor Farnsworth