Well, one problem is to ensure that the people making the decisions really are more knowledgeable and really can act in a disinterested way, rather than this ju

Well, one problem is to ensure that the people making the decisions really are more knowledgeable and really can act in a disinterested way, rather than this just becoming an excuse for a full-blown power grab. Democratic power grabs, although very problematic, tend to have time limits. Another problem is getting your technocracy to be accepted. Installing it only to have it quickly overthrown is another scenario for getting a dictator.