I can't see it ever happening. I first started learning Lisp in 2006. Some of the most common messages on Lisp forums were things like "what GUI library should I use?", "why is there no standard GUI?", "this library works but it's incomplete and looks abandoned," along with calls for the Common Lisp community to standardize around one GUI library.

If the situation hasn't gotten better since then, well... what are people waiting for?