Hi James
I'm sure people do have that option. But they will have to work out how to accept one-off donations in a world that is becoming plastic.
I am sure there are donation only ATM type machines to be got at some point and they will be discreetly placed where donation boxes once were.
I know of some Christendom Churches that have already made the changover but I also know that Witnesses are letting this change-over happen as slowly and naturally as the economy allows.
Most shops and companies use ATMs now and as you said direct bank transfers.
I don't think it won't be that long before the only time we will see coins is on walls in a private collection for people to wonder at.
When I go into self-service supermarkets facing a long line of self-pay machines at the end of a shop. It just seems to be changing over so very fast.