As Derek from Mathewsons (Bangers and Cash) says, the older guys who used to buy prewar cars have all died off affecting the value of said cars the same is happening to the buyers of Trads which is why the CX is with us, different demographic.
as i think I may have typed before, one only needs to look at the age of the average bidder buying 60`s to 90`s "classics" to know that there is a process of evolution acting on the market for such vehicles... Also if you observe where they pick up the cars from, widows and folk too old to use them or those perhaps who`s pension pots do not cover their needs.... I suspect one would have to be wearing blinkers to think that which baby boomers viewed as investments will remain so as we loosen our grip on the perch....?
Enjoy what you can and while you can seems to be a reasonable plan..?