I do not have use for MAC in the combat zone.
I will shoot the fucker or find a way to. If I can't shoot him, I will cave his skull in with the buttstock of my m4, e-tool, kevlar helmet, whatever and monkey stomp him with my boot. If that doesn't fly I will shank him with my knife or use a brick, cat, beer bottle, MRE spoon or whatever I can get my hands on. Personally I would rather not even touch the dirty little fleabags. Remeber, when you are loaded the **** down with your gear, kicking down the door of some shitbird's home you are NOT good to roll around. You are heavy and awkward.
The only need for anything close quarters when you might have to touch them nasty buggers, is during crowd control when one or a few realize that you can't shoot an unarmed fleabag and gets uppity.
BUT, the unit I am assigned to is not in the regular Army chain of command, it is under US Special Operations Command. Modern Army Combatives won't make a difference in elite units like my Regiment. It may in the rest of the Army. Soldiers may never use it in a real fight, but they will be better soldiers for having faced and overcome the challenges it presents, to the extent that leaders allow it to happen.