How are you going to Visa-integrate a cryptonote coin? VISA is going to want to know where transactions are coming from.
Not if you integrate a method that generate a disposable unique hash of every transaction and will be known only to you and can be used to verify its associated transaction and once done you can dispose it.... (its just an idea of my brain)
I support this idea, but still, blockchain things can be used, like how transactions work, they are anonymous. Anyways, when you add to the blockchain a contact to fiat coins, things change, because, there has to be an account holder name, also, for credit/debit cards, there needs to be the same. It's complicated. If transactions are kept anonymous, there is no problem, the big burden is adding fiat coins to the blockchain.
Regards
GilRH