Even aside from the reasons with respect to the recognition of the United States as a safe third country, I think there are some very good practical reasons for suspending the agreement so that people can just come to the ports of entry, where the resources are, and make claims in an orderly fashion.
What we've done now is essentially create a de facto unofficial port of entry to allow for orderly claims, but they all come through Quebec. We see the same process happen in B.C., but it's through a park and it is not the most orderly process. It would be much more orderly if they could just come to the Peace Arch and make their claims, rather than walking through the park.
From a practical perspective, I think it's worthwhile to suspend the agreement.