Change is here to stay

Or if this is done properly then you won't be worrying about getting change. Watch out for crytpocurrencies becoming a big(ger) deal in the next 3-5 years. https://www.theregister.co.uk/2019/07/23/move_fast_and_break_everything/

Just be careful where you put your money (under the mattress may not be such a bad place - wish that's where I'd put my pension contributions)