Only way oil would go down in price is if another technology took over from it, even if the whole world went on a protest strike (and how many will really..) it just means that they stop supplying it and turn the stations off, were the ones that need it and the oil barrons have enbough money to last them for any strike.
Oil isnt being replenished as were taking it, there is a significant deficet, its not like a million barrells are being made every time a oil barge leaves or anything.
The other major problem is consumption, if the world stopped development and remained as is then the oil would last a long long time, but countries like china, indonesia and india are going to introduce a whole new market like the world has never known, hence output will be higher and the oil reserves will deplete quicker.
Those 3 countries represent about (i think) 2.5 billion people (over a third of the worlds population) all of who previously didnt really have any oil consumption to speak of, but in the future..
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