the general population doesn't give a shit about ENT or VOY.
In the UK at least, Voyager is really the only Star Trek series beyond TOS and TNG that has broken into the broader cultural zeitgeist around ST. It’s apparently the most popular 1990s Star Trek show in reruns, and even people who’ve never watched it closely still recognise figures like Captain Janeway and Seven of Nine.
For the general public, Star Trek isn’t thought of as a collection of distinct series. Instead, people recall standout characters and iconic elements - Kirk, Spock, Picard, Janeway, Seven, Data, the Klingons, the Borg, “Beam me up, Scotty,” and so on. If you asked people to list memorable images from Star Trek, “that hot blonde robot woman” would definitely be among them.
In that sense, Voyager is the only true TNG‑era spin‑off that has firmly embedded itself in the wider public consciousness around Star Trek, for better or worse reasons.
A fair barometer is "Simpsons did it" - and they have with Voyager, more than once, but not as I recall DS9 or ENT. That suggests its broken into the zeitgeist and mass of imagery in the public mind of what is recognised as ST more broadly.
ENT hasn't - though its definitely found a second life in repeats here in the UK with people (re)discovering it.
If the United concept happened - which it won't - it would be banking more on Scott Bakula's present name power than it would the fact that Bakula was in ENT or ST previously.