"I think there is certainly a high likelihood. But it is not inevitable at the moment."

Until one of the major players pioneer the use of a digital currency successfully, one can expect these "plans" to be ongoing indefinitely. China has been the leader in this space and even through forceful means, a digital yuan can hardly be said to be a success. So, I wouldn't expect other major central banks to adopt this any time soon. But if and when the change comes, it will be a swift one across the globe.