Mostly out of lack of interest in starting yet another long series that will take many years before it's completed.

Maybe later.

I do find the books I read (Mistborn, Elantris) somewhat better than his WOT book. His style is more natural for his own stories, and he plays on his strengths and usually avoid his weaknesses. And for his own stories that he controls completely, he's avoided the kind of structural fiasco he trapped himself into with his WOT books.

I discussed Stormlight a bit with Sanderson after a signing, and the way he described the structure of the series to us sounded interesting.. the first volumes focussing on introducing different characters/storylines each, pretty much as apparent stand alones, and by the mid series it would start to come together and global storylines would start to emerge. At the time he was starting his rewrite of WoK, and he said he was giving a lot of thought to finding ways to avoid the problems of other long series (like WOT) where at some point it became problematic to advance several storylines in parralel and maintain pace. At the time his options were up in the air for the final volumes, he had not decided yet how he'd approach them, more chronologically à la WOT or devoting volumes to some storylines in turn (so, more in the vein of Erikcson).