There will inevitably be some centralization of development, as moving forward on a roadmap requires developer consensus. The only way to deal with that is to

There will inevitably be some centralization of development, as moving forward on a roadmap requires developer consensus. The only way to deal with that is to shift that centralization to a detailed protocol spec instead of to a specific implementation, so that multiple developer teams can build different implementations that remain inter-operable. That's attractive in theory but very difficult to achieve in practice, even with a spec. That said, it looks like at least one initiative to do this in the industry is succeeding - Lightning Network. The protocol was agreed on last fall and now all three main implementations are inter-operating on mainnet.