The drop in oil prices is like the increase in value of the greenback, short term.
Some points worth considering:
There is a longer term trend unfolding that will see the collapse of the greenback, a shift towards higher oil prices and an increase in the price of precious metals.
There will be a dramatic shift in the balance of economic power from the former industrialized nations to the emerging markets in Asia. The middle class in most western countries is on the decline and one day will be a thing of the past.
Western markets have been propped up by the petrodollar system but that is coming to an end.
Iran, China and Russia as a co-operative have more cards than most westerners realize and the west is powerless to control them without all out conflict. Which may happen.
Most conflict in the ME stems from, is caused by or is associated with the imperative of the western banking system to continue trading oil in US dollars. Any attempt to undermine the petrodollar system will be dealt with swiftly. Iraq, Libya, Iran, Venezuela all know what happens when you screw with the petrodollar satus quo.