I don't see a way it wouldn't be offered in addition to. Some EU countries (e.g. Denmark) already do something similar where we a national debit card called "DanKort" (mashup of "Danmark" and "Kort" which translates to "Denmark" and "Card"). It typically also has a VISA part to it for usage abroad.
All stores accept this as well as VISA/Mastercard since they want to maximize who they can get money for, so it's already a common place practice for payment terminals to do this. Tourism alone is enough of a reason you would accept VISA/Mastercard still.
All stores accept this as well as VISA/Mastercard since they want to maximize who they can get money for, so it's already a common place practice for payment terminals to do this. Tourism alone is enough of a reason you would accept VISA/Mastercard still.