I think that with most transactions the tradeoff between privacy and the advantages of going cashless isn't much of a big deal. They have other means of seeing what you buy, even with cash... Cash isn't completely anonymous when buying goods from a store. Anyways, a fiat cashless society seems pretty much impossible/utopia for me. I think there will always be a cash option.
I don't know about Sweden telecommunication infra but what is the plan B when the system is offline?
Having redundant systems to handle the load from the ones that go offline while they're fixed...