Just "going back" wouldn't have cut it - the BDU design is completely outdated. Just think about all the advances uniform design has gone through in the last years - combat shirts, fire-resistance uniforms, generation III ECWCS and so on - all that stuff is non-existent in woodland camo and simply going back to the BDU would mean loosing all of it or effectively producing new uniforms in an old, not-so-great-in-the-first-place pattern.
... but then you would end up making new uniforms, so what's the point in producing them in woodland camo instead of Multicam?
I wonder how pissed our military aid recipients will be when we try to pawn off UCP ACU's and gear on them.