"Japan: No Bitcoin Tax, Thousands of Stores to Accept the Cryptocurrency"
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.
To the first world countries, I think it would be possible for this to happen. They have all the resources they needed in bitcoin transation especially the speed of the internet connection. But for the countries with problems of internet and other aspects, it will be difficult.