Most content websites have become such a massive crapfest of ad-bloat, bad UX, huge page sizes and general usability hell that it's nigh impossible that I'd be able to reach the actual content of a non AMP site in the first 5-10 seconds of clicking on its link. (On my phone that's an additional 1-2 seconds for registering the tap, and 1-2 seconds for navigating to the browser)
My click-throughs to non AMP websites have reduced considerably.
So say what you may, AMP (or FB Instant or its ilk) will prosper until the mobile web experience stops being so crappy.
(Edit: About a decade ago, when mobile browsers were in their infancy and data plans were slow and limited, I distinctly remember using Opera Mini for mobile browsing because it used to pre-render pages on the server and send a very light payload to the phone. This saved you both data costs and made mobile browsing even realistically possible)