There is a certain element of that though. Sure, plenty of people have watched DS9 and just don't like it, that's fair enough, but there are also people that didn't like DS9 just because it was a stationary show.wait, it's "narrow-mindedness" that DS9 didn't capture a larger audience? That's a pretty arrogant view.
I like DS9, but I don't think that people who were previous Trek fans but couldn't get into DS9 are "narrow-minded."
Back in 2001, the BBC had a Star Trek night including a documentary about the various shows. TOS had plenty of time devoted to it, as you would rightly expect, and TNG had plenty of time devoted to it, which is also to be expected. When they came to DS9 they mentioned that it broke new ground by having a black captain, then there was a clip from some British celebrity saying something like "DS9 was weird because it was like a bus station in space and people sat around waiting for something to happen". And that was it, on to Voyager where they spent a few minutes discussing that show, then they talked about the upcoming Enterprise. The final word, the only word, about DS9 came from someone that clearly hadn't bothered watching past the first season, because it was much more important to discuss Janeway's various hairstyles.
And I thought as a public service broadcaster the BBC was supposed to be impartial.

It kind of happened with the third season of Enterprise, with the irony of Braga being pushed to the side most of that season to make room for the other writers.Still sad that Braga never got his wish on that. There were so many problems with the structure of Voyager, an arch where they were actually "roughing it" could have been interesting.