Very cool. Imagine 20TH at 1200 watts. 
it would only cause a huge diff increase, so aside from the initial earning, for a shor time frame nothing will really change
but al those miners with great efficiency, usually come first in china, this mean that those mienrs are actually promoting centralization
If distributed correctly the might end with the domination of China in the mining race...
But I don´t think it can happen....