on a very small scale the adoption begun years ago. there are currently many small merchants to big companies that are accepting bitcoin as payment. for example you can find a list of big companies here.

but it is nothing major, and i believe the only thing that is keeping it from mass adoption is the volatile price which keeps growing over time and that makes people think of bitcoin more as an investment rather than a currency they use. so when not that many people are willing to spend their bitcoin, not that many merchants would accept it as payment.