I would love shorter fantasy/SF along the lines of most mystery novels. Something along the lines of the minor world of sword/spell-wielding individual with quark and more than just another snark-fueled first person POV urban-fantasy fiction. Ursula LeGuin or Peter Beagle are the only people I can think of who have even come close to something like this in recent years.

One thing about doorstops is that they give the reader the immersive quality they would get from a movie or video-game. And while I don't believe all that space is needed to detail the world, the majority of readers love to know where the linen of the main characters' pants was produced, and publishers are all too happy to give it to them.

Ultimately, it just bugs me that we have the doorstop to the exclusion of almost anything else.