As Entrepreneurs we get into various business transactions. And consideration must be considered. Having the characteristics of money especially paper money, what's stopping you from accepting Bitcoin for your business transactions?
I think most people do not want to hassle with new technology. That is like 99% of all the reasons most people have when it comes to the question of why they continue using fiat vs cryptocurrency. Both the business owners as well as the customers are reluctant to leave behind an old system just because they have gotten used to it in time. The newer generation business owners which we will see in the coming years might think differently on this matter. But I doubt we can convince most of the old generation.