It seems to me that it would be cheaper and safer for the U. S. to get its oil from elsewhere.
In spite of those who forcast only 20 years (or whatever) reserves left, more is being discovered all over the globe.

New discoveries of natural gas in Canada have led some oil pundits to say that the reserves are sufficient for 100 years.
Tar sands can supply the US and Canada for 50 years.
Big discoveries off Brazil and Nigeria and you name it- why drill in sensitive areas? Why encourage it? (Obama, Palin, and the guy next door).

Wind solar nuclear hydrogen are coming slowly, but should be strong in 30 years or so (And why is China becoming the leader?). Even BP is a leading producer of solar panels and Exxon-Mobil-Ford-GM-BMW etc. research in storage batteries and hybrid technology are producing results.

In the meantime it seems that the world will be subject to more 'accidents' in risky drilling operations.