Point about the majority of them is, they were self-taught and turned out just fine, but also spent a lifetime becoming so and didn't expect to be able to go study sucessfully at a good music school which has a young age limit without having the relevant training...
I apologise if I sound harsh, I've just realised how short my tone was above! But, coming from a family of academics, this touches a nerve about bad scholarship... this poor person's been badly taught and now is expecting to be able to go to (by the sound of it) a good music school and just get the guidance he should have had from his tutors from a book. It just doesn't work like that. Intermediate stages of learning are there for a reason - to build experience and knowledge at the same time as repertoire - and you skip that at your own peril. Unfortunately I agree with you above - unless he's a phenomenal talent, I think this is misguided and will backfire on him. I certainly understand about the economics of extra music teachers... but if that's the case, no matter how good the school he's going to is, I wonder if it's really a suitable choice for him - because he's not ready for it.