Quebec is not responsible for the cancellation of Energy East. The economics of the pipeline and the lack of need for it are the main causes for its cancellation, not the paltry environmental concessions that were required to obtain its approval. When Energy East was proposed, oil was at $120 USD/barrel, and the production growth estimates from Alberta look a lot different today than they did back then. 
Further, the West is thriving at the moment, and the success of the oil sands and the oil & gas sector in general, though important, are not synonymous with its success or failure overall, either in the short or long term. We need to get over this idea that Canadians are somehow dependent on prospecting for primary resources and exporting them to create wealth. Primary extraction industries, as an overall class of employment and economic productivity are low and cyclical, in terms of comparative contribution vs. manufacturing and services like design & marketing.