I think there are two parts to my answer.
In the long run, we should really establish a stronger relationship with our neighbour and make sure that Canada and the U.S. operate as an integrated energy market. We have to establish joint institutions so that we are not going into these dead ends where we have countries going different ways. That is the long-term answer.
In the short term, of course, we need to build in some redundancy in infrastructure. To some extent, the railway is providing some of the redundancy. I'm not knowledgeable enough on the railway capacity versus the pipeline capacity for propane, but when the railways were shut down slightly more than a year ago because of the Wet'suwet'en situation, Ontario and Quebec did suffer from a propane shortage. That wasn't due to the pipeline issue; it was entirely due to railway issues.
We do have some level of redundancy in the system, but definitely not enough. Pipelines should be considered more, I agree, for the short-term answers, but in the longer run we really need to build joint institutions to build some level of trust between the two nations.