Well, I mean, bitcoin isn't really decentralised... Not just because most of the circulation is held by a small number of accounts, and not just because most mining is heavily concentrated too. The real centralisation is the development of the client software. As long as that team can keep at least 51% of the network on their software, they can change the rules and control things as much as they want. Past experience has shown that trying to fork it doesn't get much traction, so the network remains basically entirely centrally controlled by the official bitcoin client's dev team...