The article “Total shelves $11-billion Alberta oil sands mine” contains a clear acknowledgement that blockades like that of the Unis’tot’en Camp preventing construction of the Northern Gateway pipeline, and actions against the Keystone XL matter, by limiting pipeline capacity and driving down the value of tar sands product:
Rising costs for labour and materials have long worked against the economics of new projects, and limited pipeline access to ship oil has weighed on prices for Alberta oil. Total is signed up to ship oil on three major undeveloped pipeline projects facing uncertainty: Keystone XL, Northern Gateway and the Trans Mountain expansion.
Keep up the good work, everyone involved in those struggles, and for those not already involved, check them out and see how you can support them.