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T206Collector...the height of raw card collecting was 1987 (or thereabouts), and most of the people who collected mint raw pre-war cards started at that time, then there is probably going to be some amount of influx when those people turn them over upon retirement or, sadly, death. Lets say they were, on average, 40 in 1987. Then I would guess between now and the next 20 years, we will see a meaningful influx over this period. But in 20 years from now, I would guess the number of ungraded raw mint pre-war would be quite low.
In short, the time to invest in pop charts and graded cards with more certainty about the populations would be in 20 years from now.
These are based on guesses and unproveable theories. But this is how I have always thought about such issues.