I disagree with you, Seeker. It's far from impossible to get GCSEs if and when you want to do them, same with A-Levels. If you decide on a career for which you need those exams, you can do what you need within the space of a year. Most HEd teens, though, have a bit more insight than that of what they'd like to pursue and find ways to do that - either they go to college, or do OU courses, or find a tutor and somewhere that takes outside candidates to sit the exams.
The point is that I'm not worried if my children choose not to do GCSEs, because I trust they'll find their own way to get where they want to be - as my DH did, my extremely intelligent by failed by school brother, my sister. It's not just a few people who have no GCSEs and have to find other ways to manage, it's 60 bloody percent! If it is really that tough to survive without them, then why aren't we asking what the hell is wrong with the schooling system to 'ruin' so many people's lives? Because it doesn't ruin their lives, that's why.
The real problem is people who have no idea what to do or how to do it. Teens who want GCSEs will do them. Teens who don't won't. It's exactly the same in school. Those who want to do them will study and get good grades. Those who don't will spend two years doing no homework, feeling got at by every adult who is obsessed with qualifications, and come out the other end with no or few GCSEs. What's the difference? Except that HE'd teens who choose not to do GCSEs probably won't feel like failures and probably won't feel shit about themselves.