The few things that would "revive" UrT's popularity:
1. UrT HD gets released on Steam. People unfamiliar with Quake/UrT see this new game and hopefully like it, they find out it's a "sequel", they visit the official website, maybe make an account or download UrT 4
2. Large youtubers (500k+ subs), discover UrT and make videos on it, attracting more people to the website and downloading the game
3. Advertising. Sure ads are annoying but their effect can't be ignored, while writing this post there are ads for Hearthstone and SWTOR on the bottom and top of the site, both of these games are quite popular and marketing was without a doubt a large contributor.
Urban Terror, as far as I know, has practically 0 marketing effort. The peak of 350-500 players daily and the fact that I don't believe I have ever seen an advertisement for Urban Terror show this. The only reason I know of UrT is because my dad played it back in the day.
This post has been edited by Biddle: 22 July 2016 - 03:24 PM