Simple Economics really
Baseball cards like many other "commodities" are ultimately supply and demand driven markets. When demand outpaces supply there is upward price pressure. When Supply outpaces demand there is downward price pressure.
It is not a simple straight line, but for the purposes of this response, I will keep it simple.
Barring a massive find, the supply of vintage cards is relatively finite and not going to change. So the argument has to be made that there has been a significant spike in demand driving the price appreciation. The real key as to what happens to prices moving forward is going to be tied to where all this new demand is from and what happens with it moving forward. With the amount of mainstream coverage that has been received, don't discount the possibility that demand can still increase! That said, if demand decreases - so too prices will follow.
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