It won't happen because in the past fiat was backed by gold, but they abandon it due to volatility, Bitcoin volatility is even bigger than gold.
I believe the way the gold standard restricted their capabilities to issue currency was a larger concern than gold's volatility, but the result is the same, given that Bitcoin is not only more volatile than gold but also even rarer.
It is possible for a government to "clog" the bitcoin network for months with frivolous transactions with high fees because they're able to print infinite money? the price of bitcoin could theoretically be 2 million/coin at that point and no one would be able to move any funds.
How would a government's infinite money printing capability enable them to clog the Bitcoin network? Fiat currencies don't pay for transaction fees, bitcoins do and it's not like the government can print Bitcoin.