An overlooked benefit of the Keystone pipeline - oil shipped to the U.S. is oil not shipped to someone else (China).
The Chinese economy has cooled down a notch due to decrease in demand for products worldwide. But it won't stay that way forever and most likely return to the robust economy they enjoyed a few short years ago. And the Chinese operate on a 100 year plan (or longer) unlike the 20 minute no-plan here in the U.S.
Which is why the Chinese have been going around the world gobbling up assets such as long term contracts for oil and rare earth metals. The Obama administration deserves an F on their energy report card in this regard. Not only did they stand by and do nothing as the Chinese outmaneuvered U.S. companies for these assets but in many cases seemed to be aiding and abetting the Chinese. U.S. companies have been screaming bloody murder for years.
If the Trump administration comes up with a new and improved set of energy policies that would be a step in the right direction, but we're way behind the eight ball already. For a football analogy, it would like the U.S. starting at the goal line while the Chinese are already at the 50 yard line.