Nice idea overall but we are still a long way from realizing this dream. The first priority should be to increase adoption.
Yes, very long way to go for the gov to accept bitcoin.
You are wrong. There are already governments that has seen merits on bitcoin they are CHina, Philippines and Switzerland. China has already declared that it is the right of the citizens to own bitcoins. While the Philippine Central Bank has already announced that bitcoin is a good form of financial payment. Switzerland on the other hand has its government accepting bitcoins. With these at hand it is only a matter of time when countries will accept bitcoin as tax payment.
However that will not happen easy, the government are aware of the weaknesses when using bitcoin, they are fully concerned with the Anti Money Laundering. If you see the recent price has drop, my opinion is because of the People's Bank of China (PBOC) directing exchanges to enforce Anti Money Laundering, they are aware of the risk, and sooner or later we can feel that exchanges will be more strict in complying with government laws and regulations and will compel us to follow.