I'll add that an additional factor that will keep prices lower is the amount of crude in storage at this point... There were a lot of traders, banks and others that bought up cheap oil with the idea of hanging onto it for a short time and flipping it at a quick profit... i suspect that many of them will take a bath on the strategy.
As far as oil (in general goes), it will remain until such time that greater efficiencies in ICE engines are developed and/or readily available sources of renewable energy to replace hydrocarbons is the norm... However, there will be a time lag (significant in my opinion) between these advances in addition to the needed upgrades to the electricity generation and transmission systems that will have to be the foundation to any real changes
