If this is correct it mean some kind of "silver thursday" at some point when hoarders make the price so high nobody really want to buy it anymore and it ends up loosing all value on the market.
Hoarders just make the circulation if Bitcoin decrease, which isn't a bad thing necessarily. Just means the coins in circulation become more valuable. People have also been concerned that the ~21 million coin cap (minus the coins that are permanently lost) isn't enough for global adoption. The number of coins doesn't matter, nor does it matter if the coins are finite. As long as some portion of the total supply is in circulation, the price will be adjusted due to demand.
I wouldn't anticipate hoarders to cause BTC's price to fall. I'd think it'd have the opposite effect by causing demand to increase.