> though, would be something less powerful, but roughly the size of a Square card reader That might happen soon, since Thinderbolt 3 port has come to the mass

> though, would be something less powerful, but roughly the size of a Square card reader That might happen soon, since Thinderbolt 3 port has come to the mass with Kaby Lake CPUs (looks like no addition chips needed like it was with prev Intel's CPUs).