This won't last forever, the whole problem is caused by the Saudis, who refuse to "stabilize" the price of oil. Their theory is ... they kill off US shale oil AND punish the Russians for intervening in Syria by simply flooding the market for oil.
I DO like what it's dong to the Russians.
Pooting can't survive on $40 / barrel oil so FUCK HIM IN THE ASS!
And Saudi's can't KIL shale oil. They can "shelf" it for awhile - but eventually the low prices hurt Saudi too and they have to jack the prices again.