I do not think that this adoption will push through. VISA is already a big name of credit cards but their adoption is somehow to fast to think about. For VISA to use Bitcoin as another payment system within their system, they need to at least have a large amount of bitcoin stored since its not normal for them to just use their current money to be change into bitcoin simultaneously.

I still think its too early for Credit Cards to adopt bitcoin but having a Bitcoin ATM is possible.