Depends on the sort of change, doesn't it? Isn't that the soft-fork / hard-fork distinction? It is true that miners in general cannot use their hashpower to f

Depends on the sort of change, doesn't it? Isn't that the soft-fork / hard-fork distinction? It is true that miners in general cannot use their hashpower to force a hard-fork, but they can, I think, cause a soft-fork. And, soft-forks can do a lot of stuff.