While it is true that there are technical reasons to expect production from shale oil plays to be slow, the forward markets will react with extreme speed. President George W Bush signed an executive order opening up drilling in 2008 which collapsed the price of oil within five months, despite the fact there was no appreciable production due to new drilling during that time frame.
The reason which will trump other all other factors is American domestic politics. With the current US economy essentially stagnant, low workforce participation and 10% unemployment (U3), developing the formation would provide a desperately needed economic boost to any Administration. Coupled to that is the bonanza in oil royalties once the play is developed, which would put a huge dent in the $15 trillion + debt. Restoring finances and the AAA credit rating of the United States will also pay long term political dividends.
There will be considerable political pressure to develop the formation, and regardless of who wins this election, I think it will more than overcome the pressure from "Green" crony capitalists and environmental groups.