Stargate has some of the strongest franchise potential out there, and a well developed universe that is wide open. Few properties have that.
There are whole new generations that have never seen the original, nor care to, but would respond to a modern series.
Canning it because of fears it would only attract old viewers is idiotic.
Stargate died 15 years ago, let it rest in peace.
Stargate effectively had a single gimmick, the underdog vs incredibly powerful enemies and somehow winning. This resulted in a trope I called "Stargate Syndrome". The Underdog, in order to beat the uber-powerful enemy needs to become more powerful to defeat them, once this happens they need to create another, even more powerful enemy which the heroes need to become more powerful to defeat and then they need an even more powerful enemy to keep the series going, so on and so forth. SG1 started fighting fake gods with high tech and ended up with all the tech fighting almost literal gods.
Joe Mallozzi, one of the writers of SG1 did another series in the 2010s called Dark Matter, which started out incredibly well but suffered from Stargate Syndrome in S2, it was cancelled before the end of S3. A shame as it had a lot of potential if they didn't make the heroes effectively untouchable.
SG1 should have stayed finished at S8, Atlantis was pretty much the perfect length at 5 seasons. Leaving you wanting just a little bit more compared to SG1's a season too far (as much as I like Morerna Baccarin, it really was terribad). The reason it has a following is because it was good, the later iterations were not good (SG Universe and Origins), it will lose it's following if they keep making terrible sequels and spin offs. What we need is more original Sci-Fi, not comfort blanket spin offs.