I think since collectibility based on condition/grade was never a concern in the 50's-60's, there will always be MANY more high grade cards from the 90's. Kids took care of their cards in the 80's-90's because they knew there was value in them if they were in good shape. I think a '52 Mantle even in PSA 1 will always be worth thousands of dollars. However, even in 50 years, I doubt an '89 UD Griffey rookie in anything less than PSA 8 will be worth the paper it's printed on.
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