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They are saying that we will not get any tax and digital currencies are fake. Fraud is very easy in digital world (that is true but it also happen in every market). Although when someone is doing business in digital currency then that person is bringing money to country that is beneficial for the country...
What would be the catch anyways if we get taxes from it? Is it gonna be burden in our profits in crypto? You're pretty much going against regulation of the government in digital currency. If your local government doesn't care about cryptocurrency by not putting taxes from it, you're all pretty much treading in the dark. People will whine about scams but will government do about it if they don't care at all in the first place anyway. Government are putting up taxes due to the idea that they're protecting their people/investors.
About the time when digitals will start taking over, it is near impossible to half-possible if we put up into scale. We are yet adopting new technologies overtime, but how about the people behind us? Will they have the technology-literacy soon enough? We can't force them to learn it though. The fiat uses have been quite a practice even the ancient times through trades/barter and all sort of stuffs that exchanges something into newer thing. But manipulating that trade into technological practice might take quite a while. The beggars, do they know the blockchain? Cryptocurrency? Lightning Network (this is more of advanced but near the basic idea)? We're all still blinded or being too optimistic that digital is about to take place soon, because of our selfishness from our beliefs while we're leaving a lot of people behind.
We can't measure up the time until it happens but if I would estimate it. It would be probably "too far to be told soon". But on the brighter side there have been coins growing up in other countries already and that is yet to be considered as the first-stage or prototype stage of digital currency literacy or knowledge but again it is really "too soon" yet to conclude that we're getting there, OP. I hope you understand.