only problem I see is the reliance on all casters.

in BC 10 mans this really wasnt a problem, and really in 25 mans its still doable. But I would at least plan on seeing more boss fights in WotLK, where casters are nullified(or really nerfed) and it will rely heavly on melee. I would level up a 3 hunter team just to be safe. Controlling them will be easier than feral, rogues, or warriors.