The focus nowadays is on streaming server support, so I imagine this will stay on the backburner unless someone else volunteers their time.
I too am looking for virtual webcam output on linux. I'm trying to get a remote boardgaming setup going with a few different cameras for things like wide-angle, dice tray, tabletop view, etc, and it would be nice to be able to switch webcams. OBS can do it wonderfully, but doesn't output to virtual/dummy webcam.
And I find that streaming through youtube or twitch has way too much of a delay compared to video chat.
Oh well.