Except that's exactly what they've done for years now. The real problem is that Facebook didn't limit this from the beginning, because now companies are going to complain. I removed all my "likes" several years ago for that reason.
Facebook likes to push out extreme changes and then walk them back to what people actually want. This is the opposite of the right way to do it.
Facebook originally allowed this because it enticed both user and content engagement. Now, Facebook needs to reel it back in to preserve whatever value is left of it's activity feed - before it becomes the next useless myspace.