How do you value Bitcoin on the collapse of the Dollar? Would you still say it is worth $150,000 and $15m a coin? If a dollar is only worth the ink and paper weight then you can stack it to the moon and back and no one would give you a Bitcoin in exchange.
Someone living in a cold country looking for something cheap to burn might be interested.
Or perhaps in the future we will say. 1 ton of $100 notes is worth about 0.0000001 BTC.