"Use it or lose it" is entirely correct.
One of my clients is a small convenience store. Over the years, the mix between cash and card sales has been steadily moving over to card, and is currently around 85% card sales. About 5 years ago it was 85% cash sales! Cash is a pain for them as they need a till, safe, staff to count it and drive it to the bank in the next town, and insurance premiums cost more for handling and keeping cash. They're waiting until cash sales are under 10% of total sales and then they're going card only as it won't be worth the time and cost to handle cash when it's such a small proportion of sales. Covid was a massive "nudge" to their customers, mostly elderly who suddenly didn't want to touch "dirty" cash and miraculously found that they could work out how to use a debit card after all!
They used to have a cash machine in the store, but fewer and fewer people were using it - sometimes there was as little as just 1 or 2 withdrawals per day. Again, not worth having as it took up valuable floor space and was a pain to look after (they had to fill it up themselves, sort out blockages, etc, so it was time consuming for no gain). In fact, they said people used to use their card to withdraw a tenner and then spend the tenner at the counter! How mad is that?
I've another client whose just re-opened a small village sandwich/pie shop. I used to be the accountant for the old owners before it closed. The new owners made it clear from day 1 they were card only. Sales are brisk and higher than the old owners, so clearly the customers are happy paying by card. Added benefit for the new owners is much lower insurance premium, not having to buy a traditional till, not having to buy a safe, etc.
People need to wake up. If they want cash to remain in use, then they need to use cash and make it clear to shops, cafes, service providers, that they want to pay in cash - the best way to get that message across is to use cash, not just say they will!