I think there's still a great deal of a learning curve to know how and whether interswitching will make a big difference. I think there probably would be some occasions where there's an interswitching point that will allow southern movement into the U.S. that might not have otherwise been as possible. There might be an applicability.
I did talk specifically to South West Terminal at Gull Lake about this. They noted that Moose Jaw was their interswitching point to go south, and it's 175 kilometres away rather than 160, so they wondered whether they'd be able to access it.
Another concern I have personally is that now you're trying to coordinate two railways when you have difficulty enough trying to coordinate one railway. How exactly is that going to work? Plus the interswitching charges I believe are yet to be determined, and that will play into the equation as well.
So in theory, good; in practice, it may have much more limited application.