That's great for the minority who use Apple devices. It's not going to touch Amazon though.
If there was a cross-platform payment service which integrates with Apple, Google, Samsung (et al) Pay, and then is ubiquitously employed on mobile web, now that could make a dent in Amazon sales.
I doubt an Apple Pay-like solution alone will help much. Even on sites that support Apple Pay, a lot of them still ruin the experience by making you go through several screens, ask for details, etc despite Apple Pay being able to provide them everything they need (name, delivery address and shipping options) and make it a one-click experience.
It would certainly help. I think the push needs to come from banks and their apps, or for an independent payment processor to become popular enough (a la PayPal).
The integration needs to be easy and well implemented. I've lost count of how many sites I've gone through "1-click" pay with PayPal and then still had to enter my address details again because they haven't integrated it correctly with their shopping cart.
If there was a cross-platform payment service which integrates with Apple, Google, Samsung (et al) Pay, and then is ubiquitously employed on mobile web, now that could make a dent in Amazon sales.