This is one of those Add-on concepts that can give steemit a real boost! In addition to my other post about a steemit multi-wallet set up, where Everybody can keep & use all of there cryto wallets, which keeps people coming back, a steemit Debit Card, with the Steemit Logo on it will give steemit the, "got to have, got to get", advantage that will make steemit unstoppable.
This could be used together with a craigslist style marketplace integrated into Steemit.