The term "classical music" is, frankly, half responsible for the fact that many people, like that poster above, call classical music dead. The very term implies that it exists in the past, that it's stagnant, that it's something to be "preserved." In every other genre, with perhaps the exception of jazz (which in itself is sadly half dead), the majority of its listeners focus on the present, on what music is being made now. Now be honest, how many of you, supposed fans of "classical music," have actually listened to a piece composed in the last year, five years, decade, even the last fifty years? Not as much, I would say, as how many people have listened to music more than two centuries old.
See this great article by possibly the smartest music critic alive, Alex Ross:
http://www.therestisnoise.com/2004/05/more_to_come_6.html