I think the ongoing banking crisis in Lebanon (similarly in Egypt and maybe elsewhere too) where there are restrictions on people's access to their deposits or making international transactions should be on everyone's mind when talking about eliminating cash. The downside of going cashless aren't hypothetical or as far-fetched as people think. The whole society can be put on hold overnight. We can see this happening…
What difference does the elimination of paper money at POS make to ability to access electronic deposits? Unless you are saying people should not bank at all and keep cash under the mattress?
The difference it makes is that now you only have one way to access your savings. Any failures, technical issues, outage, etc. and you're out of luck to say the least.
The principle is that you shouldn't rely on a single system ever. If you're eager to go that way be my guest. I was using a real life scenario of how that turned out bad for people.
I don't care about paper vs electronic. I care about relying on a single point of failure.