china I think could do whatever they want, Now they are about to release their own digital money. It's centralized for sure and most probably it will be a manipulated and regulated one.
But anyway, back to the topic, I still don't see paper money disappear in the next years, the creation of digital money could only decrease the use of paper money but for sure it will still be there, and if paper money has no use in the future, it will still be present, just remember those postage stamps, not needed but still present and being collected.