What would be most helpful would be to know what sport will gain most in popularity. Maybe 10 years from now, there are 100 million new cricket card collectors in India, or lacrosse has become more popular than ice hockey in the U.S., or there's a surge in interest for Winter Olympic history.
Imagine the ROI you'd have if you had bought up NBA RCs in the mid-1980s. I can think of quite a few of those cards that have increased 1000x since then, but I don't think the same is true of any popular vintage baseball cards. I doubt there are any baseball cards that already cost more than $10 and will increase a thousandfold over the next century, let alone the next decade.
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