Suppose Gene Roddenberry decided screw it on the aliens and just made them human, in ancient time some ancient race needed slaves they died out we were free, or something like that I know that's star gates idea but it works.
You still have Klingons, Vulcans, they're just human.
This has nothing to say that it's not reality, that the show it itself is different. See the show had impacts on the scifi genre and even in some ways design of technology.
It could discourage some of the aliens in other sci fi in follow on years.
Maybe Starwars has far fewer or no aliens?
Stuff like that.
The Star Trek galaxy is full of "perfect humanoids", so this does not make that much of a difference, really.Suppose Gene Roddenberry decided screw it on the aliens and just made them human, in ancient time some ancient race needed slaves they died out we were free, or something like that I know that's star gates idea but it works.
You still have Klingons, Vulcans, they're just human.