Better question to ask should be: What happens to the Middle East when Saudi Arabia runs out of oil by 2050?
cuuuz we ain't gonna be off oil by then

. Sure, we might have cars that run on carbon dioxide or tennis balls, but you ever stop to think about all those things that require petrochemicals like...PLASTIC :O Hell, without plastic, we wouldn't even have cars, computers, modern health care, TV's, satellite radio, and yes, even bottled water. I'm sure I'm missing a few hundred thousand other items not listed, but I think you get the point.
By the way, 2050 is a rather generous deadline. By the rate of consumption of India, China, Russia, and Latin America, combined with America consuming 11 times the rest of the world (not necessarily in energy though), and I'm sure that'll trim off a few decades from that estimate. Considering China really doesn't innovate ANYTHING and just steals technology and really doesn't give a hoot about its environment, oil consumption will drastically accelerate in the coming years. They won't switch to "alternative fuels" or energy that isn't petro or coal based. If we're invading countries based on their resources, what happens when China surpasses us in GDP and just launches a pre-emptive strike on our lower 48 states' ban on drilling that's been in place for decades?? All that extra petro under ground looks damn tasty to the communists.
Oil will never go down to what it was under Clinton. OPEC already said they won't let it go below $60/barrel, and judging by the information I listed above, there's no reason for oil to drop. Inflation is driving it up, along with lack of supply and massive explosions of consumption worldwide. Now go out and buy a $5 million windmill to power your torrent server and whip out your hybrid.