Bitcoin uses proof-of-work, and therefore the majority of the hashing power decides. Why would the current stake-holders be so stupid to switch to a system which is unproven and where there economic advantages, i.e. their capital investment becomes worthless? That makes no sense whatsoever. Coin creation in Bitcoin doesn't arbitrarily change. That's why its a solid system. If such changes were possible Bitcoins would be worthless. All of this should be obvious to anyone who wants to understand why Bitcoin works. The reason is works is that hashing-power can not possibly become worthless. And those that own the hashing power will not agree to give it up. That's the fundamental limitation as well.