Wow... rocket science.. though I'm sure that many DO think OPEC -or Dubya- had something to do with the price per bbl, the TRUTH for anyone who'd bother to think is that the price is pure speculation driven. The days of OPEC being able to directly drive the price are long gone... the short term money dealers have usurped them. Though the Saud's certainly have the means to influence it by playing the market through front-men.
Hell, the President of Iran has more influence on it, right now, than everyone else combined, if you just pay attention.
Demand, though is NOT going to disappear... just the RATE of Demand increase will slow. And I think you'd see the floor drop out quick if China announced they were within 5 years of switching to new-tech nukes for power generation.
Back a few years, when gas was bouncing between 1.25 and 1.50, I thought it was stupid of the OPEC states to allow it. Thought oil should have been a stable 40-45 per bbl, though it was dropping under 20 for brief periods.