Even now we have to pay our taxes once we convert our bitcoin to fiat ,you can have your assets and once you want to liquidize your asset to your concerning local currency you have to pay your taxes ,taxing people when you hold bitcoin is not a realistic option.

Taxes are running a nation , otherwise how a nation will run ? Roads , Hospitals .. Bcoz not every nation accepted Privatization. And even if Privatization is accepted in whole world .. Then why we need a Government ?

Government means someone having Authority to deal with things on citizens behalf , When citizens will not pay Tax then why do someone show there interest in taking that responsibility. That is the first drawback in corruption inside Politicians. Due to privatization .. Almost all Elections are funded by these Private Firms and in return they got Permissions which normal businessman can not get.

I think to run a proper nation , Taxes are required.

The tax system doesn't work this way (as you seem to mean it)

They still can adopt a law according to which every transaction can be taxed (say, you will have to pay 1% of the transacted amount). Will it count as directly taxing Bitcoin? I guess that certainly will as long as they have tools (and they do have such tools) which allow them to catch you and make you pay this tax or put you in jail if you disagree. If you still disagree, think about, for example, an income tax. If someone has successfully evaded this tax in the past (and continues to evade), does it mean that income earned is not taxed directly?

I do not think so.  If they work anonymously,  how can the government collect tax  from them?  BITCOIN is decentralized and it is hard to control the number of Bitcoin users in order to have the income tax.  Therefore,  bitcoin will truly destroy the whole centralized  system and the income tax of the government

The farthest that the government can reach when it comes to taxing is the exchanges and transaction going in and out of fiat. The rest, well, they will have a hard time following tax evaders. Unless they want to take over bitcoin and starts to tax each transaction which is very highly unlikely possible. Taxing the money from exchanges is enough, too bad if they take advantage on it and put a bigger tax compared to earning fiat. 

Very long to go to accept bitcoin by the governments, really to adopt this new technology will take lot of time. But before that many people should start using bitcoin, we the community people should get more awareness to people who don't have any hope on bitcoin.

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.

When I look at the acceptance rate of bitcoin I realize that it is not longer away that governments will also accept it sooner. But still it will not kill the income tax as the government will create a way for themselves to collect the tax from their devised rules. It is also expected that the income tax will not be that much higher than what we earn with bitcoin.

There were transactions that have transaction fees , thus this fees refer also for taxes, this fees deducted were deducted also for the tax of the apps,companies or banks that were using our btc, like on sending money and cashing out. Those in built organizations pays our taxes in our behalf.