Let me know when the hobby dies; then I'll have plenty of shopping to do
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In all seriousness, in between set builders, type collectors, HOF collectors, tackling The Monster, players-from-my-home-town collectors, etc, there are enough niches to ensure the hobby never dies. There will be price corrections (I think we will see one WRT 1952 Topps Mantles), but there will always be a market for the kind of stuff we collect. ls7plus articulated what I'm getting at better than I am.