^Far be it from me to contradict what a person from Ohio knows about British pop culture...but I'm going to anyway because you're flat wrong.
Star Trek has always been rattling around, even if people don't actually watch the show.
Which is really what we're talking about here. Not how many fans something has, but how far it's influence extends *outside* of fandom.
I'm sure Doctor Who may have been popular in the states in the 70's and has had a much bigger resurgence of late, but in the interim I dare say it fell out of general awareness outside of a niche/cult following.
That never happened over here, it was simply too ingrained. Same for Star War & Star Trek.
Yes, you should correct yourself there was a British owner of a site called Sadgeezer, you might not be aware of him but he's the one who said Star Trek wasn't as big over ther as it is here, he as very clear about it too. And really back in the late '80s early '90s Star Trek was everywhere here and it influenced medicine, science and engineering. PEople for decades also became doctors, engineers and scientists bacause of their love of Star Trek.
Why the hell should I care what he thinks? I live here. I think I'd know if I was in a country where Star Trek was some obscure thing that only fans have heard of. If you don't believe me, fine. You're welcome to come over here, grab some random person off the street and say to them "do the words 'Beam me up Scotty' mean anything to you?" Odds are, they will, even if they never watched a single episode.
This is what we're talkign about here: cultural awareness. You don't have to be a fan of something, or have even watched it to be aware of it.
I've never sat down and watched Citizen Kane, but I know the significance of "Rosebud". I've never read the complete works of Shakespeare, but I could probably come up with dozens of quote from plays I've never read, not seen adaptations of. Until a few years ago, I'd never watched 'Casablanca' but when I did, I realised just how much of it'd I was aware of though being referenced in other things, without my ever knowing the source.
Some things pervade pop-culture and stay there for decades, even centuries. Others fade almost as soon as it's over.
I promise you, over here, Star Trek is one of the former and has been since the late 60's.