The pound is not just a currency, it’s a symbol of British sovereignty and independence. Will the UK be willing to trade the queen’s face on their banknotes for Euro symbols?
Cash is just so inconvenient. Sure, it’s not so bad when you’re just dealing with notes, but as soon as you add coins it goes downhill fast.
That being said, I do get that cash makes it easier to think twice about purchases as you’re not just tapping your card like it’s a bongo drum.
It’s still necessary in lots of places though, for example village fetes etc where there are no reliable contactless systems. I’ve been to events where they have card readers paired with phones but the local masts get overwhelmed with the number of people and the phones can’t get a signal, even when they have brought in mobile masts for the occasion. So unfortunately you still need cash.