I'm really in two minds about this. Part of me is excited that there is going to be another movie (or more), but at the same time I am really frustrated that it is going to act as if the last 10 years of SG-1 and 5 years of Atlantis never happened.
Since they are the original creators they have every right to do this, but then again, I can't help but feel that it has been too long and the ship has sailed. They had the opportunity to work on the TV show, but didn't want anything to do with it, so should it really be rebooted as something new?