But its not about the transactions, its about the trust.

Bitcoin is a human project, not a machine. Psychology is what matters.

Modern currency is fiat. It exists only through the trust of its users. But Wall Street and the Square Mile are not cheap to run. So bitcoin can afford its overheads. But as for the future, sci-fi writers could come up with some interesting dystopias based on feeding the unsatiable maw of the great deity BTICNOI.