The problem here is societal, not technological. An end state where people do less work than they do today but society is more productive is desirable, and we shouldn't be trying to force companies/governments/etc to employ people to do an unnecessary job.
The problem is that people who are laid off often experience significant life disruption. And people who work in a field that is largely or entirely replaced by technology often experience permanent disruption.
However, there's no reason it has to be this way - the fact people having their jobs replace by technology are completely screwed over is a result of the society we have all created together, it's not a rule of nature.
I'd be more worried about someone compromising a card reader in the field and reading cached/stored real CC details, or installing some kind of intercepting malware. (That does seem to be difficult/impossible in this specific case, but it means research in this area is relevant.)
Surely this is massively vulnerable to double spend attacks?