If it will be possible then lets face the consequences. If time comes that government would regulates bitcoin then everyone must to pay taxes. People must be honest about paying taxes.
government legalization and taxes maybe could be our obligation before bitcoin could used in any place.moreover for universal usement.if both of this factor happen, we will see it can be realized.
People would be honest about their taxes but the government should also give them some facilities against their taxes because government machinery runs only on tax payers. Taxes are the big revenue for a government. Anyway when all the governments legalize bitcoin and people use their coins all over the world, they will be in a state of relaxation and fell the whole world like a global market.