Mark, I suspect this phenomenon has already started with some of the "Trophy" records. Without wishing to sound "Regionalist" I do not think that all of our friends in the USA who are buying these things are neccesarily into the music as far as I can make out. I exclude from that a number who obviously are....but I sense a number are purely "speculating" on an investment, and probably do the same with "rare" music of other genres.
It will be interesting though, and a number of very good points have been made on this thread already.
Frankly if I am 75 and my records are not worth much by then, what do I care, I can't take them with me, and will have had a lifetime's enjoyment out of them, and that's what really counts at the end of the day.