But we're talking NFC payments here, not just Apple Pay. Those terminals (that accept Apple Pay) also accepted Google Wallet. It's the same technology in the terminals (how each company - Apple and Google - go about it on their side is different).
Last I checked, Android and iOS account for roughly 97% of smartphones out there. I'd say that covers just about everyone as well.
I know, but Apple's method is supposed to be the game-changer in terms convenience and security. Obviously Google Wallet wasn't. The retailers must think so too. Clearly the ones who abruptly turned off NFC payments are concerned, the timing of the shutoff probably not being a coincidence.