I would say TV, computers, video games, movies, and a generally complex system of life that seems to drain the creativeness out of people and take up all their time.
Plus....whose to say 10 symphonies weren't written this year as great or better then Beethovens 5th, and the publishers decided not to publish them because they thought no one was interested and the orchestras'decided not to play them because who knows why (we all know the orchestras are so supportive of contemporary composers).
