Whatever Happened To 4GL Tools?

ghoti asks: "A while back, I read about 4GL tools, and what could be done with them. Now I wonder why nobody is using them. The idea sounded so logical: Design a program at an abstract level, then add more information until the tool can create code or at least a framework. Now this might not be the best way to go about writing Quake IV, but for many applications, this would be very nice. Is anybody using such tools? Why not?"