I don't know what the situation is in the US, but in the UK classical music is slipping rapidly from being part of the mainstream education system, to the point where only those in private education (less than 10% of the total) are even exposed to it.
It is even vanishing from the exam system. My daughter plays the harp. Some years ago when she was chosing her GCSEs, the certificate taken in England, Wales and Northern Ireland at 16, as opposed to A Levels which are at 18-19 for university entrance (Scotland has its own system). I had assumed music would be one of the 10 or so subjects she chose to take at GCSE level. But it wasn't on her list.
Rather annoyed at this (my bachelors' degree is in music and the house was filled with music when she was growing up) I had words with her about it. She then showed me the syllabus, which was so dumbed down (in comparison to the exams I sat back in the 1970s) as to be utterly pointless. 'Relevance' dominated, mediocre pop music was the main focus of study, the classical canon of Bach, Mozart, Haydn, Beethoven, Schubert minimised to the point of invisibility. No ear tests, no counterpoint and harmony, no real attempt at understanding music's historical evolution, instrumental and vocal pieces of the most utterly banal quality. On looking at I readily agreed with her to drop Music as a formal subject.
I fear we are reaching a point of no return, where classical audiences will be self-reinforcing in their exclusivity, in turn further alienating this music from the masses. The sad thing is that any serious music - be it classical, jazz, jazz rock, electronic - relies on the same discipline and knowledge acquired through studying classical music not just in the development of performers, but in the development of critical listeners and enthusiastic audiences. Dumbing down for 'relevance' is short-sighted in the extreme.