Meh, when I went to the US I offered to pay in cash multiple times. Everyone preferred CC, even the small businesses, eventually I stopped asking. Even in Germany, where Cash used to be King, there are now more card only stores than ever. There are cost associated with handling Cash as well, especially when you don't trust your employes. If businesses don't want your cash, even though they could save a lot on taxes, that should tell you something. Digital payments are the future, but with Bitcoin we have the chance to bring privacy and low transaction fees into the digital realm.