For orchestras, at least it’s not their product that’s lethal, though it might as well be. With the median age of concertgoers rising, fewer than one in 10 adults reported attending a classical concert in 2008, according to a periodic survey conducted by the National Endowment for the Arts, a 28 percent drop since 1982. The financial state of orchestras today is roughly comparable to that of Blockbuster Video post-Netflix. Ticket sales are dropping; layoffs and bankruptcies abound. In the past two years, the Honolulu, Syracuse, and New Mexico orchestras closed up shop entirely; the Philadelphia Orchestra, long revered as one of the five best in the country, filed for Chapter 11 protection in April.