About a decade ago I read a very interesting document on the true cost of oil. If everyone took a "fair" profit, the cost was roughly $40/barrel. That was a decade ago, so add inflation to that number.
IMO, the cost of oil both at $120+ a barrel and today under $40/barrel is artificial. I'm guessing your dollar will come back, but not like it was just three years ago. That was an oil bubble, like so many other investment bubbles we've seen that burst. Oil is now a good value investment, so expect a rebound IMHO.
YMMV