Cash also costs retailers money: counting and delivering it, dealing with fraud, etc. – it’s just a cost of doing business and businesses balance those all the time. Right now most places I go are pushing credit cards / NFC because it’s faster and doesn’t suffer from counterfeiting.

The reason Bitcoin hasn’t seen much usage is that it’s worse on every one of those metrics. There just isn’t a non-ideological market for a slow, expensive system with no fraud protection.