why haven't we run out of oil yet?

 So after doing some exhaustive research on the internet it appears that we have found a gazillion barrels of oil reserve. So assuming all this stuff turns out to be reasonably accurate we're going to have oil for a long time. People have pointed out for a long time that oil isn't going to run out overnight, it's going to run out slowly because as it becomes harder and harder to get the price will go up up up. We will continue to use less of it at that point, because you simply can't afford a million dollars for a gallon of gas. In America we could easily move closer to where we work and ride bicycles or mass transit. Of course mass transit is going to have to make some changes as our society is becoming less stable and there is more violent unpredictable behavior in public. Mass transit May somehow have to isolate people individually into their own little compartments where they're unable to impact anyone around them. In their own bulletproof little booths. Sort of like those little bubbles in The Jetsons only they would be bulletproof and you'd have your own atmospheric control. When the mass transit got to your stop your bubble would simply eject and you'd cruise to your work location. This is starting to sound like a great option.