Always been a bit dubious about schools "careers advice"

From the FT

Sajid Javid, the new culture secretary, was once tipped by his school careers officer for a career in the media. “I was told that I should apply for a job at Radio Rentals as a television repair man,” he recalled.

Sajid Javid is a year younger than me, and when I was 20, I bought a TV because I worked out renting was just silly (once TVs went solid state the thing that would cost you was the tube, and they had decent warranties anyway). And it was pretty obvious that the pattern was generally that renting TVs was on the way out.

It's often difficult to see what the industries of the future are, but it's often quite easy to see those that are disappearing.
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MW adds, in reply to Lola's comment, there are even recruitment/employment agencies who specialise in finding career adviser jobs for people. And presumably there are other people who run training courses for people who would like to work for a recruitment/employment agency and specialise in finding people jobs as career advisors and so on ad infinitum.