Decentralization of mining is not that simple, as it is by essence a constant free competition on who can mine the next block, economy of scale will always lead to centralization of mining no matter what the alogorithm, small player will always have higher cost and less reward / hash power due to less efficient equipment , compared to big player who can investnto get the mining at cheapest cost.

This issue of decentralization is really hard to solve, and china is probably in the best envionment for wining the competitionnon mining power.