Jemmers is absolutely right.
However - and this in no way goes against what she said - let us not forget that classical music has never been a widespread mass phenomenon.
In Medieval times it was a "sacred" religious experience, considered by many as "magical" and surrounded in secrecy.
In Baroque and classical times it was the privilege of a few nobleman with power and money enough to afford it. (If you missed a performance of a Beethoven symphony you missed it forever, since there was rarely more than one).
In the romantic era, it was again the privilege of the emerging Bourgeoisie who was just trying to imitate the aristocracy by supporting classical (erudite) music.
Without radio, Tv, CDs, etc., music was a very rare experience for everyone concerned. Hence the flourishing of the piano and of the sheet music industry in the 19th century (it was the only way you could get to hear the Beethoven's 9th at home: through a piano transcription of it).
It is only after 1940 that music became such a mass phenomenom and now we have Muzak!

Now I consider Pachebel's canon a very beautiful piece of music. But I have heard it so much (it seems to be everywhere - from weddings to lifts) that now I cannot bear it.

So maybe it is a good thing that classical music does not fall into the masses liking.
Contrary to common sense opinion, I do not think classical music needs popular success to keep going. Popular success is necessary for some producer to get filthy rich, but it is not necessary for the survival of classical music. It has done well so far, has it not?
Best wishes,
Bernhard.