The problem for me is that they advanced so far that the premise became obsolete.
But that's just what's interesting about it -- the franchise grew beyond its beginnings, the same way
Star Trek grew beyond the
Enterprise (though it's now circled back to it) and
Doctor Who's spinoffs grew beyond the TARDIS. We're not talking about one series, we're talking about a whole multi-series universe. So there's room to do new, fresh approaches within the same continuity. A reboot would just be redoing what SG-1 did. A new series in the SG-1/
Atlantis/Universe continuity could be about anything.
The Stargate on earth isn't necessary anymore for interstellar travel, it is convenient to use but they can hop on a spaceship pretty much anytime and travel to the Andromeda galaxy in 3 weeks which means they could traverse our galaxy in a day and that's in a non emergency when they don't push the TPM boost button ans travel to Atlantic in a few days.
They have shuttlecraft in
Star Trek, but they still use transporters routinely. Don't underestimate the value of convenience.
With the Asgardian and Ancient technology humans in the Stargate universe are now more advanced than humanity in Star Trek, that's not evolving the premise, that's ditching the premise and doing something completely different.
Of course it's evolving the premise. The very foundation of
Stargate's premise is humans exploiting an ancient alien technology far more advanced than our own to serve our purposes. Part of the explicit mission of the SGC was to acquire and reverse-engineer further alien technology for human use. What you're describing is the successful achievement of what was always the end goal of that mission. Maybe it went implausibly fast, but that's merely a difference of degree, not of kind.
And I still don't see how doing something different is a bad thing. Isn't
The Mandalorian different from the Skywalker Saga? Wasn't
Deep Space Nine different from TOS & TNG?
And if the show was still running I'd have no problem with them continuing what they started but doing a new show that starts with earth as a galactic power is more Star Trek or Babylon 5 than it is Stargate.
With the key difference that it's set in the present day. Earth being a galactic power
now, with our current culture and national divisions and political and social tensions, is a very different concept from a united Earth being a galactic power centuries in the future. That contrast between the contemporary setting and the futuristic, spacey concepts was always what made SG distinct from the other big space franchises. (Although it would have to be an alternate-present kind of thing, since I wouldn't want it all to still be secret from the public, as I discussed earlier). And Earth being an upstart galactic power exploiting other species' technology that we rushed into using with only a limited understanding of it has plenty of story potential that doesn't exist in series about a future humanity that developed the technology on its own.
I'm not against reboots in principle, but the question is, what would a reboot have to offer in this case? If you strip it down to first principles, the
Stargate concept is pretty basic: there's a hole you can step through to other worlds. Okay, what else you got? If it were just a rehash of the movie's Ancient Egypt cliches, that's yawn-worthy. The original movie was as much a piece of schlock as the rest of the Devlin-Emmerich canon; it was what Glassner, Wright, and Cooper did with it in the series that made it worthwhile. So I don't trust the idea of stripping it back to its foundations without using the ideas the series added. And I like the television SG-verse enough that I want to see how it's evolved since we last saw it.