if no normal bussines (grocery, electronic, housing, energy, transport etc. etc. etc.) accept it, the price CRASHES= bitcoin is dead. (using it only in the black market wont save it). Decentralization is worthless argument here.
Not everybody is as deficient in imagination as you.
Soon enough we'll be able to use Bitcoins to obtain products and services from virtually all normal businesses whether or not they accept it.
OH... I see... :-)... Yeah...
... yeah...