What can a bitcoin be used for, other than as a medium of exchange, which also increases demand for the remaining bitcoins? To (unqualified) me, this seems the

What can a bitcoin be used for, other than as a medium of exchange, which also increases demand for the remaining bitcoins? To (unqualified) me, this seems the crucial question. If your money is not propped up by government fiat, it better have some non-monetary uses to succeed in the long run. (And it should not be possible to satisfy that non-monetary use by an arbitrarily small amount of "money".)