Back to your original question, suppose you are leaving the US for good to go to Uruguay. You sell your house, etc., and have $500,000 in USD. What would you do?
My answer, under current conditions, wouldn't involve bitcoin because there's no reason to add the risk of BTC/USD fluctuation to everything else. If you had put it all in bitcoin in early December you might have stepped off the plane in Uruguay to find that you'd lost 30% or more of your buying power. Of course on some other day you might step off the plane to find yourself 30% richer, but most people don't want their money transfers to have a gambling component. Exchange rates for relatively stable currencies already do enough damage as it is.
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