On one hand I can see high end audio in decline, on the other I see this as a golden age of audio. Recently I've been reading through some of my 1980-90's era Stereophile mags, fears about the decline of audio existent then just as today. There have always been complaints about the high cost of audio, always plenty of equipment out of reach for many.
And don't forget about the used market, internet gives us easy access, and think about the continuing accumulation of purchases that go onto the used market. I'd like to see some data comparing new sales to used, has to be greatly impacting new sales. I could make an argument higher end audio more affordable than ever.