I understand the first-mover disadvantages, but I keep thinking that if the new chain is Pareto optimal, i.e. is in all aspects at least good as the original chain, but in some so much better to justify the change, the initial resistance is an unstable equilibrium. Like a herd of buffaloes attacking a lion: the first buffalo to attack is in awful disadvantage, but if a critical mass of the herd follows, the movement succeeds beyond turning back, and every buffalo benefited, both those who attacked the lion and those that didn't (because the lion was chased away or killed).