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 in front of us.

Using whatever payment method for convenience in itself is fine. But, eliminating cash as medium, without providing a better alternative, one that can still work in disasters where power or network is down, is wild.