In a Peak Oil world, OPEC, by definition, will not be able to contain the rise in the price of oil; they simply will not have the reserves to do so. Since we are either at or very near Peak Oil, OPEC is now or soon will be quite powerless.

Why will OPEC end? Well, clearly once they are known to have no power they will have no reason to exist.

they are increasingly being blamed for the rise in oil prices that is starting to become a serious problem for the global economy

They no longer benefit economically from OPEC because it is not OPEC that is keeping their oil price high. No economic benefit AND becoming the object of global blame? It is not in their self-interest. I predict that OPEC will soon disband. I define “soon” as within the next three years.