If you are on a Mac (macOS 10.14.4 or higher), you might want to check out https://cascable.se/pro-webcam/
Claims to "Turn your camera into a supercharged, high quality webcam with no extra hardware required!" and lists the X-T1 as supported — over WiFi anyway, not USB. Apparently still in beta, but can be pre-ordered, and a free "built-in trial that never expires, but limits each video stream to five minutes — after which an overlay will be applied to your stream" is available for download.
I think I am gonna try it myself as I am currently undecided whether or not to keep my trusty X-T1. Also I got an X-H1 which is supported by the new Fujifilm software, and an X-E3 which is said to provide clean HDMI out for capture, but this third option does not sound too bad as it is even wireless...
