Maybe, or he could be facing a non-shifted defense having given away a strike. And again, the point here is that he not only has to get the bunt down fair, he has to get it down fair, the other way, and get it past the pitcher. Most sluggers aren't speed demons. And Mike's point is dead on about how these guys get pitched. I don't know if it applies to everyone, but I'm guessing it's similar, but Ryan Howard gets shifted and basically only sees stuff jamming him in, or off the plate outside, unless a mistake is made. Neither is conducive to getting a bunt down fair to the left side - and if a pitcher makes a mistake, well, I hope my slugger isn't bunting at it...
To me, it would be a great thing to try every once in a while to have in the back of the defense's head, but if anyone tried to do it on a regular basis, I think we'd quickly see why no one does.