Let me address this and the comments asking 'why' below:
There are GUI libraries for Common Lisp. CommonQt+qtools is essentially the gold standard, and everyone seeking to make a GUI application should use it.
I like the web, it lets me design applications with a precision native GUI tools don't have. And you can make an app that runs on the localhost and you can access through the browser: I do this for some applications I've written.
The problem is distribution: most users won't really know what's going on when they run an executable and it opens a terminal window and a browser window to some weird URL called 'localhost:41000'.
Also https://github.com/robert-strandh/McCLIM looks maintained but if it's anything like what it was a couple of years when I last looked at it, it could use some contributors :)
There are also at least 3 GTK+ bindings that I've seen around.
http://cliki.net/GUI lists 31 GUI libraries. We have enough for every day of the month :)
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?
You are more than welcome to work on it and submit it to HN. However, please refrain from being gratuitously negative in this forum; someone just spent a lot of time and effort into making something, and your comment - which took less than a minute to write - is purely negative and adds nothing to the discussion.
It is entirely legitimate to point out that somebody the submission is going in the wrong direction, yes they spend a bunch of time on it, but that is sunk cost and better they not waste any more.
GP was to the point, but not mean and added something to the discussion (even if you disagree with it). You, however, were rude.