Presently, bitcoin and fiat(paper money) work hand in hand , since the conversion of bitcoin ends in cash, very few people accept cash as a medium of payment, although very soon Bitcoin will soon overcome fiat but it will take time to totally eliminate fiat, and as a matter of fact, I don't think we need to totally do, for the sake of those who are not technologically literate enough.the next option is, after it has been converted, you make transfer or by POS.