Stormonu
NeoGrognard
I seriously doubt that a set with a complete monster roster for an adventure would sell at the price point point needed to make sufficient profit to be worthwhile. Unless the adventure is specifically designed to only use a handful of miniatures, anyway (128 pages of goblins and orcs all in one neat package with a bonus dragon for the final encounter!).
I imagine a short "Sunless Citadel" type adventure would hit about the $50 range, and something large like Revenge of the Giants would be well over $100!
The basic boxed sets for 3E essentially did that, though granted they came with rather limited numbers of minis and the rules and other materials to make a "complete set". Likewise, the game day delves, if I remember correctly come with all appropriate minis (though it's like a 4-encounter adventure, if I remember right).
Seeing game sets like Descent, Dragonstrike and Warhammer Quest/Heroquest, Heroscape and the aforementioned Basic Box sets, I know it is possible to pull this sort of thing off; the question is does WotC want to try their hand at them and are there enough folks willing to plunk down the money for the sets to sustain the line. Personally, I think they will if there's enough in the "box" to use the components beyond the adventure set it includes - enough tiles, minis and whatnot to reuse for other adventures.
I mean, I think the equivilant of two sets of Dungeon Tiles Set 1 & 2 and about 20-25 "common" minis, a couple boss minis and a minibook with 5-10 short adventures would be enough to tide someone over for quite a while, if reasonably priced (say $50-$75 range).