The danger as I see it is if prices get too low, production will shut down. When the economy comes back, if it comes back too fast, there will be a oil production shortage and prices will rocket.
Oil, currently around $20.00 a barrel production is probably not profitable in some places.
I asked an oil & gas guy who was pitching an investment at a lecture if $30. barrel was profitable (this was four years ago).
He said it still was profitable.
I doubt if $20. a barrel will be profitable for long.
We could be in for a whip-saw economy near future.