James Romeyn brought up such a great point that it really deserves a separate thread.
There's a classic car biz, a classic motorcycle biz and the criteria is basically expensive when new, famous designer, race winner, innovative technology and good looks. Early Corvette, Ferraris, Ducati 750SS round case desmo - you've got the idea.
From today's audio gear, what products that are available today can you see being tomorrow's classic gear?
What products will at least hold their value if not appreciate in twenty or thirty years?
I would like to put in a vote for Manley gear (especially pre price increase), Bob Carver's new tube amps, WooAudio headphone amps, Stax headphones as a long shot (primarily their mid priced offerings), Shugaung Black Treasure tubes, AVA Dynaco 70s and the Well Tempered Amadeus.
What do you see as holding it's own in tomorrow's marketplace? What will tomorrow's audiophiles choose from today's offerings?