The big word here is "if." IF you hit somebody with it, they could die at 39%, but that's never going to happen. That's why we want it buffed. It's a good idea on paper, much like a lot of Jigglypuff's moves, but the execution of it is so poor that the chances of you doing anything with the damn move are nonexistent. The only Mac you'll be hitting down smash on is a For Glory Mac. In a serious match, you're going to get shielded, and most likely punished, every time.
All these hypothetical situations are dandy and all, but I'm afraid that they're not going to come to fruition as long as this pathetic excuse for a move stays the way it is.