Considering that our ancestors, Australopithecus, and even as late as archaic Homo, had larger canines than us and that the trend in canine size in our evolutionary chain has been reduction, I fail to see how this applies.

Please note that I'm not saying that we don't eat as much meat as we used to. The opposite is true; due to the availability of meat, we eat much more. However, we also don't eat raw meat. We figured out ways to cook or otherwise prepare our food so that we can use molars instead.