Who cares? Let centralized entities adopt centralized currencies. Bitcoin will continue to grow regardless of merchant acceptance. It will be used more as a store of value (next digital Gold) than a currency. So long as decentralization prevails, there should be nothing to worry about.
We should be realistic and accept the fact that bitcoin is more suitable as a store of value, investment than a payment method. It is really not suitable to be a currency/payment method even though that was its original purpose.
Bitcoin network is quite slow and has limited scalability. How can it become a global payment method when traditional payment systems and altcoins are doing it better than it?
Let's face it, bitcoin is a store of value, not suitable as a mass payment method.