Again, the issue is not with the technology itself, it's with the fact that it renders all the card security null and void.
IMO to add a card to an "wallet" app, one should have to provide more than just CC# and CVV, there should be an authentication system with the issuing banks that requires more info for authentication (ex billing address, SSN, DOB) and only when the conditions are met allow adding the card. But most likely the 1-2% extra income from additional purchases these wallets allow is enough to cover the fraud.