Normally I don't think reboot is the answer. With Trek there's no reason you need to reboot - just create a new story set on a different ship.
Art and creativity are not about "need," they're about whether you can do something interesting with an idea. A lot of the biggest successes are ideas that nobody felt were "needed" or wanted, but that proved the skeptics wrong by how well they pulled it off. (Consider how hard it was for George Lucas to get studios interested in his Saturday-matinee space opera idea in the 1970s, when cinematic science fiction was mostly serious and dystopian.)
I think there's a lot of potential in rebooting
Star Trek. In its day, it was intended to be a cutting-edge work of science fiction TV grounded in character realism and informed, well-researched science (within the limits required by budgetary restrictions and dramatic license). It outshone all its contemporaries because it offered 1960s audiences things they hadn't seen on TV before. But by today's standards, it doesn't stand out as much from the pack of SFTV series, its worldbuilding is conceptually backward, and its version of history gets harder and harder to reconcile with reality as time passes. It's no longer on the vanguard of SFTV but is seen more as a piece of nostalgia, which is losing what it was originally meant to be. So there could be a lot of potential in starting over from scratch, trying to create a
Star Trek that's as groundbreaking to today's audiences as the original was to 1960s audiences.
Do you "need" to do it? No, of course not, but that's a meaningless question. We don't seek out entertainment because we need it, but because we enjoy it, or because we're curious to try new things. Anything can be worth trying, if the creators have a fresh idea and the passion to pull it off.
Or just start from scratch -- Orville did it. "Ship flying around the galaxy having weekly adventures" is not unique to Trek. If you don't want to base your show on the 1000 episodes of history that already exist, then don't, invent your own stuff.
I don't think
The Orville really counts as starting from scratch, since it started as Seth McFarlane's rejected pitch for a Trek series with the serial numbers filed off (though it's grown into more than that).
However the concept of SG1 does mean you'd need to reboot. SG1's universe at the time of SGU was very different to the time of Children of the Gods. It was no longer a scrappy team of half a dozen underdogs using modern technology. Now you could continue that story - sure, but you aren't telling the same stories of the Showtime era SG1.
You say that like it's a bad thing. There's no point to doing a new version of something if it's just a copy of the old version. That's true whether it's a reboot or an in-universe sequel/spinoff.
There were many people in the '80s who said
Star Trek could never work if it wasn't about Kirk and Spock, and many people in the '90s who said
Star Trek could never work if it was set on a space station instead of a starship. But the new shows succeeded
because they didn't do the same thing as the original, not in spite of that.