alt Hacker NewsNYC here, whole lot of cash still showing up in tip jars - there are still and loads of cash-only places around, from bars, restaurants, to street carts, you name it. JG Melon, for instance, is famously cash only. But so too is the bar around the corner from my apartment (Dynaco, do recommend).
...So people often tend to be carrying cash still.
Sure, but more places take card, and fewer people carry as much cash. Or rather, people carry less cash.
The fact that a business "famously" is cash only seems to support this, as that implies that it's becoming more unusual.