[jjeaff]

>nothing is stopping them.

I'm guessing their Network agreements with Visa and MasterCard would stop them. You could issue a stripe card that only works with stripe merchants. But I can't imagine visa allowing their imprint on a card that can both process anywhere AND be used to slowly cut visa out of the picture.

[dagss]

Many European cards have both the VISA logo and also a national chip&pin debit scheme that has nothing to do with VISA.