It is unlikely that you will need to sit in a bank and fill out forms to get a card. You will have no more hoops to go through than in-game tokens.
Which makes me wonder, why haven't there been in-game tokens made universal yet? I don't do Facebook but didn't they once have a large Zynga game thing on the go, very much tied into the platform?
A monopoly on a virtual currency should have happened by now, one that only buys stuff in games, unlocking features etc., transferable to mates.
If this had happened then it would not be that much of a leap to make the virtual token be handy for real world things. Crypto-nonsense would not be needed, it could just be like a classic in-game token.
If the tokens can be cashed out to hard currency great. But some people might never need to do that. They could buy music and apps with mummy and daddy doing the top ups.