The late-2014, Saudi-initiated oil-price war may have taken the 'boom' out of the US shale industry as it seriously threatened OPEC market share, but Saudi victory has been elusive: US shale has proven amazingly resilient. The industry has adapted quickly to the new playing field, and the unsung hero of a new uptick in drilling and investment isn't just true grit--it's sand.
The Saudi victory is equally dulled by the fact that it was not a decline in US shale production that rebalanced supply and demand; rather, it was chaos in Libya, militant attacks in Nigeria, massive fires in Canada and the destabilization of OPEC's own Venezuela.