i think it already is centralized with the possibility of a decentralized out if that centralization becomes too obvious. bitcoin could use a genuine scare to reinforce what it should all be about.
we hope that it will be centralized sometime in the future. Bitcoin rates are the highest on the crypto-currency market, and if Bitcoin becomes popular in the future, its exchange rate will probably not increase as much as it does now. By that time, people will no longer be interested in investing in bitcoins, as now. And then bitkoyn will become the official currency, for example, offline currency