Lots of people are using it, so yes it has a use, and while people keep using it (even if it's not the best way to achieve their goal), it will continue to have

Lots of people are using it, so yes it has a use, and while people keep using it (even if it's not the best way to achieve their goal), it will continue to have a use, and the skeptics (I number myself as one) should just get used to it. One definite potential use-case is FX settlement, which currently goes through an obscure (and expensive) bank-owned coop-type institution (CLS bank). I think other inter-bank and central bank uses might also make sense.