The problem with that thinking is that Bitcoin is not transaction-fee-free. Transactions are subsidized by block rewards, but already today, your transactions m

The problem with that thinking is that Bitcoin is not transaction-fee-free. Transactions are subsidized by block rewards, but already today, your transactions might get stalled if you don't pay fees. And this is only going to get worse. Taking a 3% cut of transactions (or even more in some of the walled garden ecosystems) is obviously too much for a service of irreversible transactions. We'll see whether (a) reversible transactions and the related insurance problems can be solved more cheaply than today's credit cards and friends, and (b) whether irreversible electronic transactions will be accepted by people given the sorry state of computer security.