The government has no motive to create its own cryptocurrency.  The whole point of cryptocurrency is that it is neutral.  If the government controls a currency then it cannot be neutral, it has no value over existing currencies.  If government doesn't control it, they have no interest, they might as well use an existing one.

People think bitcoin is about cheap, instant payments.  That is purely incidental.  Bitcoin is about neutrality, that no participant is granted any special powers.

If you want cheap and fast, there's many other trusted 3rd parties who will send money for you.  If you want to send payment online without some authority making political judgments about it, then you use cryptocurrency, there are no alternatives.

Crypto can try to woo the public with cheap and instant, that's great, but eventually trusted 3rd parties destroy that market.  Centralized issuers can do it cheaper and faster.  Most people today don't particularly care for neutrality, as long as they aren't targetted by the authorities they have no reason to care.

Cryptocurrency's real market is those who wish to conduct business without interference from authorities (that includes governments, banks, paypal, visa, etc).