Good point senua. I'm afraid I see school qualifications simply as notes of experience and indicators of next steps. So a C means nothing either way if it does the job. You call someone "Dr" when you go for treatment, you don't challenge them as to why they got three Cs while you have three As and can't even make the undergraduate Biochemistry course.
A A A is not only the standard offer in the more sought after universities, but they also have their own tests of suitability to further differentiate potential. So, I suppose if we continue as we are, it doesn't really matter because all that is needed is to design more tests of real potential that do the job of sorting out which students can cope.
I can't understand all the talk about how difficult GCSEs are, 16+ exams have always been ones children had to "sweat" over. Whether you sweat them at 9 or 11 or 13 or 16 could indicate the change in standards. We have so many more young children achieving 16+ exams these days. Good teaching goes a long way, but to say that standards are similar does not make them similar. The more academic schools have to run their own tests for sixth form applicants exactly because potential is not necessarily obvious from GCSE results. Again, it's no matter if standards stay as they are, since better opportunities are already subject to extra tests used to supplement GCSEs and A levels.
Hope that won't give rise to cries of unfairness. After all, additional tests of potential and competence are open to all. There will always be some "universities" that don't use them and still charge £9000 tuition. So everyone can access a degree, and tell themselves that all degrees are the same. 