I didn't see Johnson making the speech but I've just read the Guardian article. I have to say, I'm not convinced
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In my view, and it is my opinion only, the rot set in when the idea was put forward by Blair that 50% of people should go to university. This is where I might get onto unpopular views....but University used to be meant for academic people, those who could flourish in an environment where they were expected to think academically and learn truly new things. Not everybody excels in that, other people excel in being plumbers, or teachers, or whatever. There is no "equivalence" between academic and vocational courses, they are just different.
Saying that we should elevate the status of vocational training or jobs shouldn't mean that we reduce the standing of academic people and complain when they get paid high salaries. I think Johnson is playing to the Red Wall and trying to divide and conquer.