I completely agree with you, however, I don't think that what you, or any group of unorganized (non-unionized) Canadian pilots would prefer is what matters here.
What matters is money, plain and simple, and the cheap ass owners of Sunwing and whoever else wants to engage in this practice will decide how this will play out. I doubt very much that the Canadian government is too concerned about the jobs of a couple of hundred pilots for six months per year.
I wish it were different, as I say, I completely agree with everything in your post.
I'm mostly flying now with European FOs who came up through that system, and I'm not a fan, however, at least it beats the cadet system.