The falling apart is the only issue I'd have with that, as that would make it a moot point. Skeletons and walking corpses are all I would want; however, corpses are never going to be plentiful enough that ones that last only a day would have any real use. That'd be like if all cars only lasted a week; no one would use them because they just didn't last long enough to be worth it.

So could I make a near-mindless skeleton last an appreciable (as bones don't really rot) amount of time? Weak minions en masse are all I'm talking about, not vampires.