Actualy this is a good perception or ideas coming up for your on thought thats theres a possible to create a bitcoin master card  soon,but i thinks its would probably implemented first for those country having regulated and legalized cryptocurrency like the country of japan or some eurpean countries,but some other countries thats not allowed bitcoin to become regulated,i thinks its impossible to become implemented of using master cards as a bitcoin because one would make stop this are the world goverment and the banks because they thinks its a competion to the banks investment  and the legality of its own purpose.