article published July, 5, 2017
https://edgylabs.com/2017/07/05/japan-no-bitcoin-tax-stores-accept-cryptocurrency/
"AirRegi is a widely used, tablet-based point-of-sale app in Japan. Currently, around 260,000 establishments, stores, and commercial facilities use this proprietary app to accept payments from their clients."
It makes sense that a transition to accept bitcoin would be underway for more US-based stores.
It is true that the more people accept Bitcoin many retailers will accept bitcoin as well , because there will be great demand for it. When many all over the world accept bitcoin, the emergence of retailers will be sporadic and it will even be surprising how it will be, as retailers will be so many because people have come to embrace and accepted bitcoin for many purpose and uses.