Many believe that the centralization of mining pools is harmless since the miners can switch pools when necessary (like cockroaches scatter when disturbed by light). This belief is flawed since it assumes that miners will do it just because they can.
Moreover, switching from one large pool to another large pool may not help if both the pools have been co-opted by the governments. And, governments do have tools (like IMF) to coordinate with each other to co-opt mining pools across their jurisdictions.
Miners have to find pools which have the willingness and ability to run covertly. Current financial incentives of large pools discourage joining such covert pools. We must reverse them to decentralize mining.
PS: This is an attempt to write a simplified version of Eric Voskuil's Cryptoeconomics one chapter at a time.