Galaxy Quest as a series will only work if it's about Commander Taggart and his crew, not about the actors that played them in the eighties. At least IMO.
Gotta disagree. The whole point of the movie is that it's a comedy about washed-up sci-fi TV stars having to be space heroes for real. That's what "Galaxy Quest" is, not the imaginary show-within-the show, which is just a thinly-disguised version of TOS.
A straight version of "Galaxy Quest," featuring Taggert and Co., would be just another space opera. It's the show-biz spoof angle that makes "Galaxy Quest" Galaxy Quest . . ..
Done right, this could be a lot of fun. The movie is sublime, though, so the bar has been set high. (I actually dragged my Star Trek editor to the movie when it first came out: I thought he was going to bust a gut laughing.)
And this isn't going to hurt Star Trek any. Pretty much every Trek fan I know
loves Galaxy Quest. Star Trek is big enough to take a little good-natured ribbing.
Finally,this isn't a case of having choose between a Galaxy Quest TV show or a new Trek series. Different studios, different properties, different approaches. One doesn't preclude the other.