Good point there OO and makes sense based on the obvious moves away from cash...
Though checking this out the Bank of England say there are £70 billion of notes in circulation (in the UK) which is 2x as much as a decade ago... used for everyday payments, in tills, ATMs, held overseas for illegal uses apparently, and still a fair amount hoarded and stuffed in matresses (even after Ken Dodd's passing)
I definitely carry less cash - though I do need it when I'm up north; in the big smokey city of London I hardly ever need it
Though wallets are surely gradually going the way of map pockets and watch pockets - for an eternal life on Sufu?!