Going cashless doesnt necessarily mean to use bitcoin.
+1 in this because there are so many online money that can be use aside from bitcoin and altcoins,there are others that offers similar option .
Government wont consider bitcoin since it is decentralized which they cant control and not to mention the high volatility.
but of course there are other governments now that accept Bitcoin,maybe you are saying that majority of the world?
There are many existing payment method nowadays and government are not relying on crypto alone.
In time,let us just not get tired in expecting this to happen in future.