In the future, bitcoin will surely be adopted in large numbers, and maybe more altcoin will be combined with many industries. But we don't need to worry about government taxes. They can levy taxes on your wallet.
Bitcoin popularity is already increasing too much, now we can see that even in backward countries people are using bitcoin for different purposes, I am sure that in future bitcoin will be the main currency of the people and they will be using it for everything for which they are currently using fiat currency.