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What I am afraid of to happen, is the time will come that our transaction will be tax..
transactions will never have taxes!
taxes will be paid when you buy something or sell something or in other words when you are doing business , it is the same taxes you pay when you buy with fiat.
Yes I have same opinion.
There is no way to tax transactions. On the other hand if you buy something and the store gives you the receipt then you will pay taxes after the conversion in local currency like as you have in your pocket US dollars go somewhere in Europe buy something with dollars and seller gives you a receipt in Euro.
While it is certainly true that taxing transactions can be a hell on its own and would most certainly require a hard fork (to be done properly), which would instantly kill Bitcoin, nevertheless, effectively all transactions can be taxed if governments somehow manage to tax Bitcoin miners. For example, they could check all block generating transactions (wallet addresses) in their own ledger, and if some miner doesn't pay a tax, they will go after him...
That may be hard to implement, of course, but still a lot easier than tracing individual transactions