I gotta definitely agree with that one, and I've seen it happen in motorcycles. Just try to find a complete, somewhat near original 70's Triumph or 70's/80's Harley-Davidson nowadays considering that everybody just had to personalize, maybe even customize or chop, those bikes back when they were new. Bicycles are going to be no different. Ten, fifteen years from now it's going to be very difficult to find a complete original bike that isn't a very high end Masi or the like.

Second problem with fixies, which I find a bit more pervasive to the collector than the last paragraph: Most of the people building them are young and living in the city. Which means most of these frame are going to get beat - badly, both through normal wear and tear from city streets which are usually less than ideal, and from the usual 20-something behavior of acting like some form of maniac (trust me, I was there, too, 30 years ago). Now, if we're talking something along the lines of a Raleigh Gran Prix, no screaming loss, as there were a lot of them made - although they're getting more difficult to find nowdays. However, my teeth start to clench at the thought of this happening to a 531 double-butted frame, or equivalent. And it really goes off the scale thinking about an actual track frame, which until the last couple of years were always rarer than the road frames.

To each there own, I guess. Just the same, as a vintage collector who's watched Honda CB750's with the original four pipe exhaust sell for two grand more than an equivalent bike with a period aftermarket exhaust, I'm watching a lot of future collectibility go down the tubes for a 20-something affectation. Which will probably burn out on about five years, after which a lot of nice but beat-to-uselessness frames will end up on the junk pile, lost forever.