Most people, including myself are turned off by the fact that you have to divide bitcoin into ridiculous decimal places. Most people also don't care about having to do the math behind it to figure how much bitoin is worth this object etc etc.
You don't know that. You are just assuming that everyone is like you and that people can't adapt.
Also, people have used small fractions in the past. You probably don't realize that the dollar is worth much less than it used to be, and people routinely dealt with small fractions of a dollar when it was worth much more. You could buy a lot of stuff with a half penny. Did you know that that a farthing is 1/960th of a pound sterling?