Having worn the MultiCam A2CU downrange, I can say it's vastly superior to both the bag and the ABU (GTFO, right?). Granted the shirt is not sewn to the pants (sorry pointy-nose guys), but the cut, the material, the design and the camo pattern are all more effective for both flight (without a G-suit) and daily ground ops. And, OBTW, there's plenty of space for patches.
The single-source solution for all branches should be MultiCam ACUs for shoeclerks and A2CUs for aviators. All that remains is to make a 1-piece pajama for the ejection seat dudes.