I fail to see how you jump to this conclusion. Suppose that all bitcoins are lost except one. Well, we just use fractions of the one remaining. While the prot

I fail to see how you jump to this conclusion. Suppose that all bitcoins are lost except one. Well, we just use fractions of the one remaining. While the protocol currently supports 8 decimals, there isn't any hard limit; we can continue dividing forever as needed.