Something might happen in the future, nothing is impossible. Bitcoin has an important role as a digital currency that is very valuable.
When the government starts legalizing bitcoin and its transactions for legal payments, the government will easily implement tax rules. I think tax is not a new idea for cryptocurrency, especially bitcoin.
The tax will most likely help the government pay its debts. The US is a superpower, but it surprised me when they were also faced with a sizable state debt.