bitcoin transactions very quickly, because we could do it anywhere at any time, just press the button on your laptop / mobile, if there is internet, we can directly do the transactions. Because that, bitcoin transactions is very fast
Yes that is a fact that the transaction of bitcoin is very fast and can be done on a single click, but the problem is that of transaction confirmation, as the transaction confirmation may take a lot of times and really make trouble when you are in market and waiting just for the transaction confirmations.
But if the shops will estimate for the favorable fees of transaction and they will have believe that in that much fees the transaction will not be cancelled or not be returned they they will easily rely on only the click on the transaction and will not bother their clients to wait for longer in the market.