Yes, I read that. I would guess that of the kids who learn the recorder in primary school, about 0% of them are still playing when they are 15.
I read of a case, on the same recorder group that I am on on FB, of a guy who had a very accomplished recorder quartet of 11 year olds. They performed in the school and the rest of the kids took the piss out of them so much that they all gave up. I think that's a fairly British phenomenon (I had a reasonably talented piano pupil in one school who, again at Year 6, decided she didn't want to do it any more because it wasn't "cool") but would like to be persuaded otherwise. My impression is that mainland Europeans are far more culturally broadminded than are the British.