I don't think the BTC will be regulated, as it will be exactly the same crash like in EU zone, equalisation of every currency - terrible mistake of EU.
Governments will still need to collect tax money to provide services to population (and to waste it of course) so unless people want to physically move to an completely unregulated country, leave their family and friends, they will have to disclose their assets and be taxed according to the law of their country (unless they want to break the law which is another story). For this to happen, governments have to carefully study what btc is and write laws that let people use it freely (and not banning it stupidly like Russia did).
That's my humble opinion anyway for what it's worth...