John Carmack has left id Software.

I expected this sooner or later, now it is official: John Carmack has left id Software to fully concentrate on Oculus VR, he [quote]I wanted to remain a technical adviser for Id, but it just didn’t work out. Probably for the best, as the divided focus was challenging.[/quote]

That leaves Kevin Cloud and Tim Willits as only remains of the Quake development team at id.