> I don't see a way it wouldn't be offered in addition to.

Yes, it will for most nation wide chains, touristic places, and anywhere that has comfortable margins.

For smaller shops and tighter business models, dropping the costlier networks will be the first thing they do. Same way a decent number of shops won't accept Amex, or just no card at all.

Now if we're is cheap and popular enough, there might be more stores getting rid of cash as a reaction.

We’re seeing the opposite in the US where smaller shops aren’t taking cash, presumably so they don’t have to deal with managing it. There is a cost, but I’m sure every business has already priced goods accordingly to pass those fees onto the consumer.