How you going to pay in BTC if the person refuses to accept BTC..? Hold a gun to their head? You cannot assume away the point that I was making by saying, "if you pay in BTC" when you have not even gotten to that point yet, can you?
Of course. However some places do take BTC, yet I've never seen one whose prices are BTC nominated, and don't move with the BTC/USD price. So in reality the prices are still un USD (other fiat).