Note that (in theory) it's the "economic majority", not the "miner majority" that matter: https://en.bitcoin.it/wiki/Economic_majority https://en.bitcoin.it/wik

Note that (in theory) it's the "economic majority", not the "miner majority" that matter: https://en.bitcoin.it/wiki/Economic_majority https://en.bitcoin.it/wiki/Economic_majority If a bunch of miners decide to change the protocol but the majority of users stayed on the old protocol then those miners would be mining a worthless (or at least less valuable) fork of the blockchain.