I really question drawing a conclusion from analytics saying people are using it versus actually liking it. I know some folks at work have used it and they regard it as broken enough to call in a ticket about their device being broke.
Analytics is a pretty well known idea. I question the base theory that it will answer this specific question.
Also, given that the indicator for an AMP page is a greyscale, hard to see icon and words, people who don't want to use AMP might hit it because they are in a hurry and the text they are looking at is black and noticeable.
