Well, taxes also don't automatically get removed from your bank account either...
It would be the same if Bitcoin became universally used. Governments would just accept payment in Bitcoin, but you would be responsible for making those payments and reporting your income etc.
Also, isn't it nice that they have this big ledger (blockchain) to see what kind of income you have received.
Yes i somehow agree with you. Well without taxes also the governmeny doesn't have their source of income, am i right? Each country's improvement depends on taxes mostly, and aside from that the government wouldn't allow it technically so i guess taxes couldn't be removed, or they will find some alternate solution.