It will not be called a crypto currency if it is centralized. But they can make their very own artificial digital money where they can have an unlimited supply to the people. But of course it's totally different from bitcoin, once they will keep on supplying it, that currency will be eaten by the inflation unlike bitcoin it's demand is getting higher when it will reach it's total supply limit.
Cryptocurrency is more like being digital and they are connected because they can be found in the internet and if the make their own artificial money for themselves then i think it will be more stabled than the usual cryptocurrencies or digital money because the government will make that tweaks for their own money to be stable just like fiat and it will be a good alternative for the fiat because you don't need wallet anymore because you just need device like smartphone then you can bring your money but if we talk about investment then the real cryptocurrencies will still the winner.
Yes government will make that digital currency that they will be making stable to make the people comfortable on using it. There will be some sort out microchips or RFID, this type of transaction and wallet is already implemented not just on US but as well as other rich countries, if I'm not mistaken it's already being done on Switzerland. But I hope that they will consider bitcoin on it.