Nowadays most people use electronic money instead of banknotes, so the process of eliminating cash has already started. Developing and launching CBDCs will take up to 5 years. It will take above 10 years to become finally cashless.
I am ready to say that in 2050 there will be no cash in circulation as we are now accustomed to it.
And it seems to me that 10 years is not enough, because there are very underdeveloped countries, they will take longer to make the transition.