Well, they'd have to discuss the legality of taxing cryptocurrency transactions, as they basically take place "nowhere". The IRS has already taken an (albeit clumsy) approach to it, which I'm sure any half wit attorney could wipe the floor with, but there's still the inconvenience, not to mention all the people that will pay without even having a second thought about it. Worst case scenario, I guess transactions made through an American exchange (in the case of Americans, of course) might be taxable, but in the end that only makes a case for using Tor(if needed), and some exchange elsewhere. Either way, if the IRS wasn't capable of coming up with a better solution, it's not unrealistic at all for me to expect a much dumber move from my government, as they make idiocy a religion here.