While not directly related to Bitcoin, this article discusses several statements and moves being made, by major economic players, toward higher taxation for top income earners.  One of the ideas floated is a one-time tax on capital assets.

http://online.wsj.com/news/articles/SB10001424052702304355104579232480552517224

A better argument to buy Bitcoin (or gold, silver, etc...) I haven't heard in a long time.  Not that most of us really needed one anyways...