Cards are moving towards no card at all i.e. virtual cards. USA is very slow in adopting new payment technology compared to the rest of the world. I live in South Africa and tap to pay is so much of a thing that you do not have to worry if you leave your card at home as you can tap at like 80% of the merchants, and if you can't they will have a fall back like QR code etc, NFC enabled cards have been around for years and all the merchants are really quick in adopting them.
this is dope, and also something I have been working on on android (yes I am gonna be that guy, Android has supported this for a long time)... it's great for informal merchants, and maybe waiters that run around a bar collecting bills from customers... but actual POS devices aren't going anywhere, there is always gonna be a need for them, this function has been there and even has a name (softPos) many companies can give you this functionality TODAY on your android phone, so yes apple devices can now participate but it won't shake the market as everyone thinks.