The problem with Gov coins is that it can only work with some sort of centralization, and that is the opposite feature of crypto currency where it is by design decentralized. But a digital currency would enable Govs to bring in some features of crypto to the fiat system and this way somehow discourage use of not recognized crypto currencies.
Well I think there were also some crypto in market before but all of them are finished some of them were fraud and some so them were fail and bitcoin is totally different than other crypto so I dont think so its easy to bring new crypto with standard like bitcoin in market because bitcoin have thousands of good quality and now its almost every part of the world.