Even if this was to happen, I wouldn't be excited. The original movie was pretty weak (although it was still better than Stargate Universe, which was barely a Stargate series) and SG-1 was what made the series as famous as it is, so I don't see how ignoring that would make for a good movie. Besides, after star trek, when I hear that a franchise I like is getting rebooted, I just can't think of it being any good. It could be done, but honestly I'd rather them just let the franchise stay dead.
First off, I don't think the Stargate movie was better than SGU but that's because I think SGU was the best of the entire franchise. Second, your position that you would rather see a franchise die to cling to your aging memories of them rather than see them continue in a rebooted mode just makes you nostalgic fanboy rather than someone who really has the best interest of a franchise at heart. Stargate is fast fading from public memory and Star Trek was also gradually slipping from public consciousness before the reboot sparked renewed interest.
I'd rather a franchise survive and grow than die because I may feel some angst about all my "accepted fantasy related" beliefs might be threatened or re-imagined. In fact, I find it odd that so many aging fans probably share such a childish reaction. But that's just me.