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05-16:  5.3
06-16:  5.4
07-16:  5.5
08-16:  5.6
09-16:  5.7
10-16:  5.8
11-16:  5.9
12-16:  6.0 (1,000,000 USD!)

If you think that Bitcoin will largely replace fiat currencies, then it must reach at least one million USD.  With all of the horrible economic news (massive national debts, governments seizing funds from bank accounts, the serious weakening of all fiat currencies, etc.) that has been going around since pretty much the turn of the millennium, I would not be surprised if this pattern holds, or even turns out to be too conservative (e.g., the milestones happen sooner than projected here).