You've asked some provocative and significant questions.
Personally, I think that the run-up in oil prices is a speculators' bubble. Certainly there's more demand for oil, especially from China and India. There's also instability in some oil-producing regions. But such a rapid increase in price doesn't make sense. People are essentially investing in oil because the price is going up.
Like all bubbles, I think this one will burst. Maybe we won't see $30 barrels of oil -- but I've heard one economist say that $50 is possible.
If it doesn't burst ... well, I think we are in for more class conflict. The haves would drive and fly where they want ... and the have-nots wouldn't. That's a problem. It wouldn't be the end of America. America has been through greater crises. But it wouldn't be a happy time.