Co-author here. There is a common misconception that consensus of the Bitcoin community is correlated with the hashing power of the miners.
A miner can have 51% of the hashing power, but if the blocks he produces are not accepted by clients (i.e. people with wallets, merchants, and the like), his 51% hash power is completely useless. His blocks need to be recognized by the clients, and if the clients decide that they do not want centralized mining pools, and decide that they only accept blocks with a second cryptopuzzle in them, miners who fail to switch will produce blocks that are unrecognized and therefore useless.
A miner can have 51% of the hashing power, but if the blocks he produces are not accepted by clients (i.e. people with wallets, merchants, and the like), his 51% hash power is completely useless. His blocks need to be recognized by the clients, and if the clients decide that they do not want centralized mining pools, and decide that they only accept blocks with a second cryptopuzzle in them, miners who fail to switch will produce blocks that are unrecognized and therefore useless.