In Germany you have a better acceptance with Girocard (and guess that's true for most other national systems up there too), and all the popular national systems within the European Payments Initiative will probably convert into Wero (At least that seems to be the plan).

So they will start with a big initial acceptance and cards in circulation. Usually they are cobadged with MC/Visa, so customers won't probably even won't notice that they will paying with Wero in Europe