The government cannot rely on CBDCs by eliminating the function of paper money, this will invite risks that can stop transactions when the power goes out. CBDC can be used as an option in making transactions, some are more comfortable using paper money and some are using CBDC.
Everything is going digital, so I'm pretty sure paper money will disappear sometime in the future. I know CBDCs won't replace paper money right after they're launched, especially when not everyone will want to use it for day-to-day payments (like the elderly). We already have decentralized digital currencies (Bitcoin and its variants), so why should we care about Fiat going digital anyways? Once CBDCs take over the world, you can say goodbye to privacy for good. Who knows how many years do we have left before this happens? Just my thoughts