VISA will destroy your credit report and that will likely cause other lenders to cut credit lines, close accounts, and ramp up your interest rates. Selling Bitcoins with credit cards is easy. Selling them online to an anonymous person isn't so easy.
Does this mean we could sell mtgoxCodes or casascius coins or private keys in shops, because we can proove to visa we actually sold the code to the customer?
Sure. If your chargeback rate exceeds industry standard you can expect your merchant account to be closed though. Honestly I think if you have a physical shop you might as well just accept cash. I mean getting the network of stores is the hard part. If you got that demanding cash isn't much of a limitation. Just look at GreenDot (MoneyPaks). GreenDot could allow their cards to be purchased with credit cards. Of course that means their cost would rise by the credit card discount rate, less merchants would sell them (high chargebacks hurts the merchant's account) and they would need to factor in the inevitable rise in fraud plus investigation costs into their product.
They accept only cash and sell nearly a billion dollars a year worth of code.