Some people will NEVER sell their bitcoin to the gov...like me! 
Me too!!! NEVER NEVER NEVER
Well, I might sell them a few bitcoins. If the government is giving me 1kg of gold per BTC.
You might just live to see the day that 1 BTC is equal to 1KG of gold, but I'm doubtful that the US government actually has any left.
Oh, I'm sure there are a bar or two left in Ft. Knox... They wouldn't spend that much money just for theater, right?
...
RIGHT?
Fort Know hasn't been audited since FDR.