Another problem with this is, if a doctor or an airplane maker screws up, I can abandon them and go for a replacement immediately. With politicians I'm pretty much stuck until the ignorant masses change their minds.
That's why I'm a believer in highly federated, localized "competitive government".
So am I. We only differ in scale.
In principle I agree with you, I just think that your scale is not practicable. Democratic government is a necessary evil, because without it, the stronger members of society start bullying the weaker members of society until a mafia emerges that doesn't give a shit about the non-aggression principle.
I would love to be proven wrong though...