I keep seeing this idea invoked over and over again, and it's starting to bug me. The problem with this idea is that it conflates technical decentralization and the spirit or ideals of decentralization. The latter can be betrayed or degraded even while the former is preserved. Just because the miners aren't compelled by the network architecture to implement a fork doesn't mean that there aren't social dynamics which have the effect of centralizing decisions made by those miners. "Consensus" doesn't have any inherent value or rightness. Consensus is just a majority of a group electing to do something. In the world of the decentralized web, consensus is positive only when network nodes are truly acting autonomously. It's best when this means that each node acts in self-interest, without regard for or in ignorance of the interests or positions of the other nodes. This is not what's happening on the Ethereum network. There's a huge amount of coordination. Ethereum is a network that hasn't individuated itself from a relatively small group of creators/maintainers/community members. As long as the network depends on these people for strength and stability, the miners will be biased to carry out the wishes of those people. Otherwise the miners risk losing whatever value they've accrued through their work. So yes, the fork only happens through a consensus of the miners. But it hasn't been established that the miners are capable of independent action.