eventually at some point the price will prohibit use, thats the only way to lower the price,,it's a supply and demand thing. Demand is high and supply is at close to max since with the lower prices until a few years ago it was not viably smart to explore the more costly ways of getting up oil.
There is no lack of oil, just lack of current ability to produce and refine the stuff. And with no real urge from oil producers and oil companies to see the price/profits decline by increasing the production we are stuck with the situation as is.
Are we running out of oil? NO, are we limited at bringing up enough to meet current demands with the fields currently in service? YES, will it change? that is the question that will determine our future as we know it.