It's not that easy. You're being very glib. There's a cyclical problem that happens when new players only play on one-map for weeks to months that selects out the new players who like diverse content by making them quit, and at the same time keeps the new players that can somehow stomach doing the same map 24/7. You can't fill up a server or keep its population half as easily because the 24/7 server tactic breeds generations of new players who won't play on anything else regardless of how many shiny things you dangle in their face.
It's also very telling that TR didn't used to be anything of particular importance, but meteorically rose in popularity by copying AOD's 24/7 server tactic. Compare this to other clans like EW and Divine which always had to struggle to keep their populations, despite having more active members online at all times populating their own servers.
No, Motoko is right. The reason why people play on the 24/7 servers is because they're popular. They're popular because they have people playing on them. That's pretty much all that goes into it. As someone who only plays from time to time, this is the single deciding factor for me. Does it have players on it? Then I play on it. The 24/7 servers are popular because the clans that are playing on them are large, whether they are just super old and have been around for a long time (AOD used to be a JK2 clan, way back before JKA was even a thing) or they're a legitimately entertaining group of people to be around (tR deathstar, despite being on one map, is a great server to play on just because of the trolling and shenanigans).
This framing of the discussion around superiority complexes is even more ridiculous when you realize that this is an NA specific issue. EU clans (and also some NA clans!) use RTV on a lot of their main servers. They're still very popular. Now, granted, you see maybe the same handful of 5-6 maps getting played (dotf, deathstar, BoC, lunarbase, smuggler for lulz, dxun, echo base, commtower, etc), but as others have said, that's just because a lot of the other maps are extremely hit and miss in terms of quality. Have you ever played Doomgiver? Or a lot of the UM? Or Cloud City? Most of those suffer from severe issues both in terms of bugs and quality which don't make them fun to play.
Confusingly though, we've seen renovations to a lot of the more well-played maps like DOTF and Lunarbase, but not really seen any renovations to the old, neglected maps that nobody finds fun or interesting. And we've seen the idea also get bounced around from the developers that maybe RTV should become mandatory on servers. Why should server hosts be forced to allow maps that are low quality and that the developers aren't updating? I agree with the notion that RTV should be integrated into servers as a mainline feature instead of running as a separate script, and I don't disagree with the idea that updating maps (yes, even classics that people know and love like DOTF) is a good thing - it just seems like weird priorities to me? But then again, I can't really criticize when no action has taken place.
Now as far as what
I would suggest doing is what was mentioned earlier in the thread but didn't seem to get much traction. Try talking to the leaders of these large clans and see if they'd be down for having RTV on their servers, perhaps as a weekly event, like Friday RTV day. That might inspire people to play RTV more often, not just on those event days.