If you try asking the Codex about fantasy setting, hell, even quite a lot of them had enough of it. And then, there's the factor of publishers who can't leave the comfort zones, and when faced with an option to either take risks or stay, they would ask, "Orcs and Elves sells, right? There's no need to deviate from that formula."
For genre other than fantasy, there's already Copper Dreams, Stygian: Reign of the Old Ones*, Consortium Series, Krai Mira, InSomnia, and many more.
Planescape: Torment, while appearing like Fantasy, actually had its own charm and just felt so out of place when compared to other fantasy RPGs. I don't know, I'm not sure. PS:T stands out and that's probably one of the many other reason why it's THE Best Written RPG, if not THE Best RPG of All Time. While it seemed inXile is working on fantasy games, Torment: Tides of Numenera is supposedly a successor to PS:T, and from the looks of it, it already evoked that feeling of being out of place in fantasy genre, so expect to get hooked to it like you were to PS:T
though it seems they would continue down to Bard's Tale IV after T:TON, so we gotta wait for some more time before they reveal their plans for the trademarked Van Buren and Meantime.
As for Wild West RPG..... hmm, it's too bad there wasn't much going on in that setting.
*still on Kickstarter crowdfunding process. 10 days to go.