I also think that the current cryptocurrency may be less in demand after banks create and start using CBDC.
I don't think you understand how different other cryptocurrencies are from CBDC. Sure, people can use that to send money, but it's not like it would be store of value. CBDC is just fiat money in a new form. It will be better and cheaper form but people won't be buying it like gold and speculating the value would rise. And depending on the platform it could end up being a farce. Although i am certain they will take their time and not push out product that isn't tested and ready.
And it wouldn't be money of the people. Also transactions are going to be reversable for that contract. That's goes without saying.