In an ideal situation, we would be able to use bitcoin cards and actually have no bitcoin/fiat conversions, there cards may come in handy to some, but in the end theres that
middle man again, and with him comes the fee, and that is why i dont like it.
When u have situation that you have bitcoin wallet, and merchant is accepting bitcoins, then u have advancement, all this with debit cards is the same trick from the past,
which brings little new offers to the table.
cheers