To ensure some sort of centralisation never happen, the best way is still to spread the hashrate concentration to multiple new pools. I guess since there is more and more people coming into the game, and a lot more will come I think because of the price rise, actions will never have to be taken.
I doubt that will happen. The Chinese seem really persistent on controlling the Bitcoin mining industry. I think that something really big has to be done if we want Bitcoin to stay as a decentralized currency. And I don't see many more people getting into the Bitcoin mining business because the Chinese look like such a dominant force.
I think bitcoin will not become centralized. I really sure if more countries accept bitcoin china will not able to control/influence bitcoin price anymore. Anyway minning is not forever, isn't it?