Realistically:
Stargate has never been a powerhouse franchise - it's done very well in a niche market. The most viewers who've watched an episode of Stargate: Whichever appears to be fewer than five million people.
That's peanuts. Those are the kinds of ratings that set off panic at Paramount when their Trek franchise dipped so low.
Now come the cries of "apples and oranges..." yep, fewer people watch cable than used to watch first-run syndication or even (gasp) UPN. Doesn't matter - a few million people is a few million people where the question of whether it's worth MGM's money to try to rekindle this thing. Given that at these levels there is precisely one viable outlet for SG in the current TV marketplace - SyFy - and SyFy is showing no interest in SG now, the TV franchise is...well, in the spirit of the season, how dead is a doornail?
There's always talk about them doing a sequel to the original movie. That, at least, makes some sense as the movie was a bona fide hit - in 1994. OTOH, that may as well be sometime in the late Mesozoic as far as the group understood to be the core audience for this stuff is concerned.
No, if Stargate has a future at all, the current logic of the business would be to remake the original film in an attempt to launch a new summer film franchise. The only question MGM has to answer here is whether the property has sufficient name recognition or other value to justify the amounts of money that would be required in order to make this kind of movie - an expensive, effects-laden adventure film - viable theatrically. All kinds of TV shows get resurrected as movies, but there's a difference in budgets and promotional costs for a big screen comedy - say, remaking My Mother The Car with Steve Carell - and an actioner like this.