when classical musicians earn so little.
The real money in music is in music production, composing, DJing, club nights, breakthrough bands, etc. Even that is not what it was in say the 1980s. There is next to no money in classical music performance.
I'll all for children learning to play an instrument for pleasure, read music, music theory, etc. However, I do wonder why parents would not actively discourage their children from spending too much time playing an instrument during GCSE / A-Levels. I think it's one of those things that is considered a "good thing" without it ever getting looked at objectively.
I would much rather my child was composing electronic music or sounding a computer game than reaching a top level playing the violin, because frankly the former is not only more creative but also more career-enhancing.