I long for the days of $100 oil. 
It may be awhile, but it will be back.
The concentration of efforts by the industry are in the unconventionals.
As seen at OTC last week, only a select few of the deepwater or other conventional targets are seriously being considered at $50 oil - companies just cannot afford to layout such large negative cashflow for years without the expectation of higher prices out there.
http://www.houstonchronicle.com/business/article/OTC-attendance-down-as-offshore-loses-its-groove-11122942.phpEven with the fantastic technological advances we have seen, the unconventionals when you get down to it are controlled by geologic horizons. There are just not that many susceptible to producing liquids out of such tite formations profitably.
Prices will go up after the inventory runs thin, whether in 2 years or 10 years. OPEC will then be back in business.
Glad I am retired already, as working under stringent conditions is no fun.
And the good news:
1. Countries other than the US are the ones really taking it on the chin (Glad we are not Venezuela)
2. And for the Younger folks - the oil ain't going anywhere either.