The pseudoanonimity of the system may be very bad for taxes once people - the new generation - start to learn how to become anonymous. Unless the government have NSA-tons of computer power, following the steps of every transaction to bust tax evasions would be impossible. And I don't want my government to have NSA-tons of computer power.
Isn't cash pseudo-anonymous and bad for taxes? If you get paid cash-in-hand for stuff; there's no record. Plenty of business and self-employed people work this way. All Bitcoin transactions leave a paper-trail online, all aso uthorities have to do is try connect the dots.