If that would have been easy then it could have been already being followed everywhere. But its not! Merchants fear because they have to track the sales, earnings, pay taxes and much more. There is no provision for this purpose yet and thats why they might not just accept it so easily. For customers it gets difficult to wait in the coffee shop until they get sufficient confirmation of the bitcoin process. So there are not single but many problems in using this currency. Until the time we dont see huge set up for this then we cant see any progress as whole really.