Quite honestly if you asked me a few years ago if I'd be able to go into Whole Foods and buy my groceries with Bitcoin I would have laughed... well I did it last week!!!
Bitcoin is only getting bigger and better that's pretty obvious!!!!
All the curancy in the world is leagal tender and has to be taken by the people in that nation that issued it as legal tender for any goods or services. There are 6.5 billion people on this planet. Not one of them have to take a single bit coin as payment for anything.