It's also then a self fulfilling prophecy, and means that not just is it from a narrow talent pool but that we end up with people who are all very similar. More and more, we get the people who think they might want to go into politocs trying to get into PPE, and then effectively being professional politicians with no outside experience.
I agree - I think it is important for someone suitable for the top job politically to have some very serious political experience, but the 'group-think' that we have at the moment where so many of our top politicians are identical from the point they entered university is concerning.
The electorate then are given an idea of what a politician is supposed to be like. That many seemed to think Johnson was a 'breath of fresh air' was both laughable and frightening.
And the notion that he was somehow anti-establishment when Johnson was achingly establishment - Eton, Oxford PPE (including Bullingdon), brought up to expect the top job.
The most unedifying aspect of Johnson is that I think the country has suffered from a long standing feud dating back to the playing fields of Eton. I don't think that Johnson could stand the fact that Cameron (Eton, Oxford PPE(including Bullingdon)) had got further than him even though he was a couple of years below him, so he had to have the top job too to prove he was as good as his old school chum.
Problem is that if you go into politics to prove that you got one step further than your school chums you are doing it for all the wrong reasons. The only reason to go into politics is to make a difference.