I'm beginning to question whenever CBDCs will be able to replace paper money for good, or will it co-exist with the old system? After all, credit/debit cards didn't manage to replace paper money when they launched. For being in the 21st century, I'd say paper money should be phased out as soon as possible. Everything should turn digital, as we live in a digital society.
In most western countries, branches, atms and so on have started to decline in their availability instead of expanding like the past. When this transition is complete, the only way you will be able to contact a bank is digitally or by the phone. Cash won't be available from them, and cash will probably only be able to be traded in with the limited access points available or by established facilities, or encouraged to be spent/deposited as soon as possible.
This period of time seems like 5 - 10 years away plus, however I think this will start to occur within the next 2 - 3 years. It will act to reduce the circulating money supply by excluding what the banks and governments see as illicit cash from being a part of the system, while being able to properly calculate the supply of fiat money with CBDCs.
At this stage I think this will be a catalyst for fiat money as supply reduces, of course short-lived as the money is technically worthless anyway.
Cash will be abolished, credit and debit cards definitely will not face any disruption during this change. The only thing that will change is the $ or fiat symbol will change to the CBDC ticker/symbol. Likely, UM and BRICS, depending where you are.