He declined to comment about whether AMP pages would rank higher, though he said some of the signals Google uses for search include whether a page is mobile fri

He declined to comment about whether AMP pages would rank higher, though he said some of the signals Google uses for search include whether a page is mobile friendly and how rapidly it loads Showing only results that use AMP would be a very coarse cudgel to enforce page speed. It is entirely within Google's ability to simply directly measure page speed, and to my eyes the more sensible course of action given the capability.