bluetooth and scanning can be used without internet. and if ever the government made their own digital currency
they would consider everything speed of transaction,features of the coin in question,efficiency,security etc..
internet wont be the main factor on a transaction if the government made a digital currency.
Governments already have digital monies. It is the same fiat money existing only in digital form. In fact, the cashless form is overwhelming by amount, paper money makes up only a tiny percentage of all money in circulation in today's economies