The world economy is going down the drain due to the enormous debt build up. In order to prevent total chaos when the castle starts breaking apart governments will want to confiscate as much wealth as possible. They won't go down without a fight so to say. And their best fighting power is taxation of different sort. How far they go is the question. I don't think they would go to the obscene levels Anonymint speaks of (70%+ taxation) but who knows.