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.
I think more retailers would be able to accept bitcoin when we have the technology to streamline the process as currently there are a lot of roadblocks when it comes to devices or technology as there is a very subtle but distict differences i. CAPabilities between retailers and I think that is the reason why bitcoin is still not widely accepted.