Because Bitcoin's "coins" are just software abstractions that represent real world scarce resources denominated in watts, it's going to cause real world decentralization generally. The sociotechnical implications of this are not well understood after ~200 years of increasingly higher scale centralization resulting in nation states.
Discussion
There are two trends right now: A trend of centralizing political and financial power, and a counter trend of decentralizing systems.
If Bitcoin stays decentralized and secure, and I personally think it will, the level of real world decentralization the planet is going to experience is going to be staggering.