Cryptocurrencies made by central banks are more likely to be easily be manipulated to favor their business over market. They might as well make amends with the government for favorable regulations. They will also more likely to be stable coins. The blockchain technology can revolutionize the market but it can also be used to make only some capitalist businesses take more control over the market. Hopefully, things can work out and they can be fair with their clients.
Well if the central banks want to deploy and release their own stablecoin the blockchains system that is implemented to the coin will certainly be a lot more centralized and by that the blockchain will lose its nature of irreversible transaction as well as the anti manipulation. Basically just the same as the current system the bank currently has and yes that's pretty much sums up what'll happen in the future.