What is Europe in this sense? In the Europe I know, every small business has accepted cards for decades. The exception if there are some children selling strawberries to tourists.
As for your second paragraph, you seem to be dreaming. Americans are some of the best tourists to deal with, and anybody who works in the tourism sector is happy to receive them.
I haven't been to every country in Europe, it is true.
A few years ago I shut down a website in Poland for someone because people didn't want to pay with cards, they wanted COD. My colleague took a train regularly in the Netherlands a few years back that was cash only. Dutch websites also have to offer whatever the Dutch payment provider is (I forget). Another colleague in rural Spain found that the price they were charged was lower if they paid cash by the exact amount of VAT. In Germany I ran a website that had to allow bank transfer as a payment method because 'companies generally don't have credit cards' according to the locals. Up until Covid travellers from our office to France and Germany always needed to use a few Euros. Up until Covid it was an absolute taboo to buy drinks with a card in the UK and Ireland, unless it was with a meal. My local chip shop is cash only today, but none of them had a machine before Covid. My local Chinese restaurant tells everyone the card machine is dodgy to see if they will pay cash. They only installed it during Covid.
I think we will manage without Visa just fine.
> and anybody who works in the tourism sector is happy to receive them.
Of course they are! That is literally their job. It is everyone else that has a problem with them.