Tax free in Germany when you hold the coins for longer than a year. Otherwise when you cash out to USD or EUR the in and out investment tax applies under the Einkommenssteuer.
Not a problem for me, I will be holding for a good while longer.

Yes. Profits will be reduced, and the number of participants will be reduced. But it's not easy to tax, because bitcoin is circulating around the world. Not subject to the control of a certain country

It's hard to put tax on every bitcoin transaction so i don't think it will happen in the future, and the fact that we already paid transaction fee which cost quite expensive will make me think twice if they put tax on it. However they can tax the exchange according to the country tax regulation, make strict verification so people will pay their income tax from bitcoin.

I'm sure the government has been eyeing bitcoin, let alone seeing its existence today bitcoin really on the clouds,
then it must be very potential for the state income.
But they also know to set taxes to bitcoin is not easy because one of them they must inaugurate bitcoin in the country and detect anyone who uses bitcoin is also very difficult.

I think tax would have many good affect to bitcoin than bad. My point is, if the government decide to pay tax on earning and using bitcoin, that's mean they have ways to control it and protect the user, especially they will have law for bitcoin transaction and even more. Thats not really bad actually, bitcoin holders will feel safer when decide to use bitcoin, scammer will be punished (just like crime, stealer, robber,...) by law. secondly, taxing will help that country avoid from losing money to another country and losing tax from payments, and I believe that, the economics of that country will grow up because the money from bitcoin is take part in their finance.
BUT, till now, there are no way for government to control and tracking bitcoin transaction (and never will). So, I don't think they could put tax on it. lol

yes I really like your advice, because transaction costs will continue to increase, as the development of bitcoin.

I do not think this is possible, because the government does not know how many people use Bitcoin, it is hard to determine, if Bitcoin imposes a tax on it, then I think it would be very difficult.

obviously the profit decreases if the government participates taxes on users bitcoin ,this is a disadvantage for me but I must be patient for bitcoin success this in fact also feels difficult because the nature of bitcoin is hidden and we can freely expression wherever we want like a ghost friend not seen by the ordinary eye

you obviously don't understand how bitcoin works. which government and how would impose a tax?