Canadian buyers? Or Canadian sellers?
Canadian sellers, especially of inexpensive items like my books and your headscarves, should be pleased, since many of our American competitors are pricing themselves out of the market with the inappropriate use of a service that should only be used on much more pricey items. (pierrelebel suggests $100 minimum and even eBay suggests $50 and up).
But I suspect the market will not be within Canada, due to high and rising postal costs, but to overseas destinations, where buyers already expect high shipping and will shop for the best shipping rate on equivalent items.
Canadian buyers probably won't see much change, since most of the problems seem to come from new sellers and sellers inexperienced with international shipping. Those sellers won't see what the problem is until they are trashed by a very angry buyer, at which point there is a strong likelihood that they will quit shipping internationally entirely.
Some people juggle geese. Small ones. Goslings.- Hoban Washburne