Total centralization would kill all key features for what we value cryptocurrency.
I actually think that decentralization will kill all currencies or a place to store money owned by third parties. people will be more trusting of their own self
For sure it is possible in the future, because it is giving the people a lot of opportunities because of its decentralized economy. And I'm thinking about for the next 5 years for sure all over the world. Bitcoin is going to be a method already of payment by almost all companies and it is going to be a need by that time.
large companies like Microsoft, Dell, and Expedia have begun taking bitcoin as payment. Few start accepting bitcoin roughly one year ago, a number of major companies are not. Only introduced 7 years ago, Bitcoin is still growing.