The big problem is the average non Star Trek fan, or worse the Star Trek hater, takes a look at a couple episodes and will say "oh, ok, whatever it's just people fighting in space with ships and laser gun pew pew". So, as that is what they think Star Trek is: that is what they make.
Plus the average Star Trek hater can watch the top ten Star Trek episodes and just be like "BORING! Needs more Pew PEW!"
Very true. Most modern folks in charge are unwilling to take very much risk. They just want the 'free money of the sure thing'.
A couple years ago, super hero movies were not so hot. Then, really out of nowhere, some folks to a wild chance on a movie called Iron Man. And the MCU with that high money point of The Avengers. But it's not just 'super hero'. After all plenty have tossed up other super hero movies that have not done so great.
So unless your 'space movie/show' is based off one of the Star IP's, you will just get looked over.