You have absolutely no idea what you're talking about.
1) Oil production goes up and down depending on supply/demand and is regulated by OPEC, but there is so much oil left in the ground it's ridiculous. Yes, eventually there will not be much oil, but it's going to be a very, very long time.
2) Oil is a commodity, and commodity pricing fluctuates greatly, but it will not skyrocket and run the risk of being underused.
3) OIL WILL NOT BE ANYWHERE NEAR 900 dollars a barrel in the near future. I have no idea where you came up with that insane number. You realize that's EIGHTEEN times what it is now, right? Also, your idea that oil prices keep going up is silly. We reached a high last summer but prices now are lower than they were 5 years ago. It's cyclic.
4) Your "math" makes absolutely no sense. Even with your crazy numbers. You do realize that planes take more than one person, right?
5) Plane tickets to Europe will remain cheap because people aren't traveling. The infrastructure for travel is already built, and they have to sell the seats. This is the best time to travel to Europe from the United States in recent memory because the prices have gone down considerably.
6) tickets are cheap and will remain relatively cheap for a while to head to Germany and the rest of Europe. Now, I can't say the absolute best rate will be there in a few weeks, but your knee-jerk alarmism shouldn't scare people into not taking their time planning out their trip.
All in all, please spare us your whimsical predictions on the worldwide oil markets and their affects on international travel.
1) Oil prices are regulated and controlled by the major commodity holders of said commodity -- in this case, America and Saudi Arabia, for the most part. If one day they "decided" there was little to no oil left, then they certainly have the right to charge whatever people will pay them, be it five dollars a barrel or five hundred dollars a barrel.
2) Duh, that's why we have the stock exchange.
3) We said that when barrels of oil were going for about $40 each. Now they're closing in on $175 and we don't believe they'll pass $200 / barrel "anytime within the next twenty years". At least, that's what all the stock analysts told us...
Then again, weren't they wrong about the recession? -- weren't they wrong about "no companies will suffer any severe losses or bankruptcies" (cough cough Lehman, cough cough, AIG bailouts). People are wrong about a lot of things -- our research (scientific research... unless you believe that religion put all the oil in the ground o_O;

shows that the deeper we drill to find oil, the more expensive it is to extract. The farther down the miners have to go, the more the consumer has to pay to refill their tanks.
When you think about it, crude oil prices CAN go nowhere but up, unless some idiotic stockholder wants to take a major loss by selling at $75/barrel today and try to buy back at $400/barrel the next. It's not going to happen.
4) Planes are almost always full nowadays; even at full capacity some airlines are not breaking even. This is simply an effect of the broken economy and the refusal to let go of precious commodities such as oil for cheaper prices.
Do you want an example? -- in North Dakota gas prices are roughly $1.80 per gallon (3.78 L / gallon). In Canada, in Sudbury, Toronto, Windsor, wherever, gas prices are closing in on $0.90 per litre (~$3.5/gallon). It's almost double!!! -- for simple transportation costs across one minor border? (Vancouver right now, at least where my grandparents live, is $0.96/litre, meaning $3.7 / gallon)
Countries regulate what they control -- and they do it at the expense of other countries' economies. But they don't care -- all a country cares about is its own citizens "well-being"... it's too bad America hasn't set its priorities straight about "fixing their own country"... (I'm sure they will soon, but right now things look VERY disorganized from a Canadian POV)
5) That's from America -- because you guys drill the oil and sell it across states for literally no customs or travel taxes. From Canada, a one-way flight to France is ~$688 CAD.
6) I never said people shouldn't travel -- people who want to go to Worlds will find a way to go to Worlds, if they want it bad enough.