I guess mobile physical wallet will be created and they will contain the most part of cryptos that will be mainly adopted.
I see it like contemporary debit cards that are able to pay also in fiat different from the loaded one, taking some fees for the exchange.
I imagine it, with a sort of QR code, and a private code to increase security
Small amount can cost some extra charges you're giving 5$ for just one cup of tea.Anyways its hard to bring your laptop to restaurant or just for the sake of Tea or coffee.You can use your mobile app too.