If bitcoin becomes centralized it would not allow for it to grow further. The purpose is that controlling specialist always aims at even more and more profit, which often affects the consumers. To eliminate this bitcoin has to continue as a decentralized digital currency. Sometimes typically the miners gather together as a community and boost increased fee for purchase or something linked to that, but they too will just not support centralized system. Miners too will get affected when this happens because they will be under a new head.