Edit: I don't think I overstated the popularity gap between Star Wars and Star Trek. TNG went off the air 26 years ago. People in their forties and up are very familiar with it, but it's pretty niche for anyone under 30. Star Wars is watched almost universally, even by people with little interest in Sci Fi and children who were born long after even the prequels released.
I'm not sure off the air is a very useful metric. Streaming services aside, Trek shows are on cable pretty much all the time. Just like TOS was all over the place in the 70s.