No. That's precisely the point. My opinion or Core's (be it Monero's or bitcoin's) is irrelevant if the majority of the network won't back it. Any dev can "change the protocol", what matters is whether the community at large runs those changes or not.
BTW there were people who didn't agree with Monero's new mining algorithm and decided to keep the previous version. They failed because the majority of the Monero community (not only Monero Core) decided against their choice.
