I'm not so sure, the formula may be getting tired. Even 'Star Trek' suffered when 'Voyager' and 'DS9' were made at the same time, and there wasn't even the intention to have 'SG-1' and 'Atlantis' playing at the same time, it just kinda happened.
If they can keep the quality I will continue to watch, and I would think I'm the same as anyone else, but the comments I've read on the direction 'SG-1' is going have not been good. 'Atlantis' must always be harder to write for. You can't fall back on cheaper 'Earth-based' stories like 'SG-1' does, and they have failed to flesh out Teyla's people properly. When they do visit other worlds the episodes have been inconsistent in quality.