I remember some commenter saying on Scott Sumner blog, with reference to the discussion whether bitcoin is in bubble or not.

  *The price of bitcoin is volatile, because the future of bitcoin is volatile*

Yes in one of this futures where Bitcoin is The Money having a whole bitcoin will be a big deal, in which case it will make no sense to speak of the price of bitcoin in dollars.

I can think also of a transition period when bitcoin will widely acceptd and function in parallel with the dollar. For such a future the price range seems about right