I don't see ops image, but I just want to say that if it ever comes to a situation, where a few people control most of the miners, people would notice that long before. And they would do something about it.
The issue would be who would do something about it?
Would you be willing to mine at a loss (cost of computers + electricity > value from mining) to stop this? If companies in China, and their low cost of goods / cheaper electricity made it so mining in the US/Europe was not profitable, would people just still mine for the good of BTC?
Would individuals in China still mine if large companies could undercut their value as well?