There is no country that only uses Imperial. Americans use grams for weed. And technically what the US uses is called US Customary. Some units are different from Imperial. Funny thing is both Imperial and US Customary are legally defined in metric.

Next it will be politicians. Before the end of summer I bet.

No, not all of Europe solved this. The payment systems they made are for internet payments with instant confirmation. Many European nations are still on the Visa Debit or Debit Mastercard systems for card payments. https://en.wikipedia.org/wiki/Maestro_(debit_card)