Because as soon as it becomes centralized it'll cease being Bitcoin, won't it? I've always thought BTC is decentralized by its nature and hierarchy. If it is, how can it be centralized, anyway? Is that possible at all?
Don't worry dude, nothing will change the nature of bitcoin, even if it's a government. the government can only provide rules for data verification later,
but they will not be able to force it because of anonymous users, centralization is only present when you join in exchanges under the government
Bitcoin has gained the popularity only because of its decentralized nature. The cryptocurrency cannot be centralized (Ripple is not the real crypto). That is why BTC will remain the same digital money as we know it.