I personally expect that the Obama Administration will eventually approve the Keystone XL pipeline, possibly (hopefully) with the same limitation as on the Alaska pipeline - none of the oil or product can be exported outside of the USA.
I would add another condition: the pipeline owner must provide a perpetual, paid up easement for the entire pipeline property and its easements for new publicly owned high power lines for the national grid, to be built (or the building financed by) the pipeline owner. One of the limitations with wind power is that its sources are located far from where the power is needed and far from connections to the existing power grid. With the full length and extent of the Keystone XL pipeline property and easement areas added to the grid, this could marginally improve the future prospects of clean, non-polluting wind energy.
Just trying to make some lemonade out of lemons here, since I expect that eventually the pipeline will be approved.