As I am often of a contrarian perspective, so too is the case here...
Despite all of the angst and hand wringing in this hobby, I feel that high end audio is well positioned for some substantial growth in the next 25 years. Also, I agree with a lot of what Sugarbrie has to say. Beyond which, there are some additional factors I feel come in to play:
1) Size. I realize this issue keeps coming up, but has anyone seen the reaction to LG's debut of the 102" plasma at CES. It's utter lust by most. No one complains of the size of televisions, in fact, we all know that big is better when we talk tvs. People will put up with a stereo in the living room. What's more, when their thirst for a serious tv becomes quenched, the next thing on the shopping list is going to be an audio system capable of playing on the same field as their glitzy new tv.
2) Status. There has certainly never been a shortage of nose in the air dealers willing to sneer at what we currently own while pointing us ever higher up on the totem pole. But, the mistake the high end has made for a very long time is that their target audience has been audiophiles. They have always preached to the converted. Now that magazines like The Robb Report are beginning to delve into the waters of audio, the products we lust after will begin to be exposed to an infinitely wider audience. How difficult would it be to convince people that big speakers should be as prized as big tvs??? It's marketing, people need to be told that they want and NEED big speakers.
3) Price. Following #2. A non - issue. No, let me restate that, it's a benefit to be exclusively priced. How many people think it's just grand to have a $10K watch on their wrist? Loads!!! My wife wears a Rolex, and to be quite honest, it tells time no better than my daughter's Timex. In fact, it's actually been worse over the years! We've had to send the darned thing back twice. But, that pride of ownership is there in spades. Like fine watches, wine, cognac, cigars, cars, firearms, shoes, clothes, jewelry, and furniture, high end audio is a marketable commodity. Again, blame the manufacturers for lousy marketing of the product...
4) The ascendancy of Asia. Particularly China. Music reproduction is taken far more seriously per capita in these cultures. As the wealth of countries like China continues to grow at an exponential rate, the sales of high end audio gear will follow suit in these places. It already has begun gaining traction. Does anyone think that all of what the Asian based companies is being sold to North Americans and Western Europeans? Again, blame it on the stupidity of the companies based in North America and Western Europe, but they risk not marketing in Asia (and, also Eastern Europe & Russia) at their own peril - not that I believe them wise enough to know better anyhow (see #2 & #3). Those who keep harping on the sweatshop conditions and oppression in China refuse to see that the standard of living is being ratcheted up faster than any society in the history of this world. These people are buying televisions, cell phones, vacuum cleaners, dishwashers, jewelry, cars, wines, AND stereo equipment.
In the end, my advice is to sit back, and enjoy the music. From my perspective, high end audio is not about to die, it's on the verge of an explosion in growth.