Now, it seems, he is done.
I’ve only read a fraction of Moore’s work—I’m not exactly a ‘comics’ guy, though I do enjoy them occasionally, and read many of the ‘greats’ (Moore, Gaiman, Miller, etc.) during the 1980s and 1990s. But I’ve probably read more of Moore’s work than that of any other ‘graphic novel’ author.
And I vividly recall reading The Watchmen series when it was first released in 1987—I was in high-school at the time—and being completely blown away by it. The Watchmen remains, in my view, the greatest single superheroes story ever told.