" Those opposing the pipeline need to take a longer view."  OK, well then:
1). It will take at least 4 years to get the pipeline built, commisioned and operating.  Maybe longer due to aboriginal court cases, protests and logistics in getting the right size tankers.  PM Selfie better find a way to get the oilworkers at least 4 more years of E.I.
2). Sure some near term work digging trenches and importing pipes made in China. Good employment plan for China and S. Korea.
3). More taxes for AB and the Feds.  STARTING FOUR YEARS FROM NOW, at best.
4). Anyone remember how BC's Northeast Coal worked out? ( $ 1 billion wasted on an unused railway due to inadequate world prices and demand drops). Not saying it's a sure thing for oil, but it likely will be. That would be the " LONG VIEW".
5). Canadian Border Services could block some imports ( cars, electronic gadgets, whatever) today if the gov't decreed it do so. The result: immediate boost in manufacturing  employment - no 4 year wait.