If x > 0 then x/0 = ∞
As outrageous as it may sound to say that bitcoin will be worth infinity dollars, it isn't a statement with that much gravity. It's merely another way of saying that the USD will go to zero.
Even if bitcoin falls from the #1 crypto, even if it goes down to 1 BTC = 100 ETH and no one hardly cares about it anymore, once the USD has ceased to be "money" it will have no value. So your .0000000001 bitcoin that can buy you only a candy bar with, will still be worth infinity dollars.
HODL my friends!!