No, states are not introducing their CBDCs to compete with cryptocurrencies. First of all, they try to make their non-cash payments more efficient. After all, it is no secret that digital currency is faster and more cost-effective compared to non-cash payments of states that use the long-outdated SWIFT system.
CBC = Central Bank Currency = Fiat currency
CBDC = Central Bank Digital Currency = Fiat currency digitalised
As you say, states are not introducing their CBDCs to compete with cryptocurrencies, but to make the payment system more efficient,
but as a logical consequence, they will make stablecoins backed by fiat useless:
all being equal in term of efficiency, why would you use a stablecoin
backed by a CBC when you can use a stablecoin which
is a CBC? (Why would you use Tether when you can use digitalised $?)
CBDC is not
backed by CBC, it
is CBC, in digitalised form.
Compared to a CBDC, a stablecoin backed by CBC offers no advantages but only an extra layer of complexity, costs, risks... less efficiency.
So, unless CBC-backed stablecoins offer a better technology than CBDC (could happen), in my opinion CBDC will eliminate fiat-backed stablecoins.
But CBDC won't eliminate hard assets-backed stablecoins, like gold-backed stablecoins
