A dictatorship is a brilliant idea. However it fails on the "Leader in morbid fear of being shunted into the poor house if he/she upsets enough folk" rule.
Dictators tend to be of the Hitler/Mugabe/Stalin ilk.
However, give me the keys to No 10 and I'll prove you all wrong.
Arthur C Clarke had a great idea. An annual lottery takes place and the one ticket picked gets to run the country for 12 months. Better to pick someone dragged kicking and screaming into office than have the idiot dragged kicking and screaming out of it.