The treaties you're examining today basically relieve both excess taxation and, to some extent, double taxation, while protecting the Canadian tax base on inbound investment from abroad. I don't think these treaties have much to do with outbound investment from Canada.
Treaties are focused on inbound investment, basically. In the United States it's extremely clear that's what they are focused on. Even without the U.S. addition to that, treaties are focused on whether Canada will tax the foreigners investing in Canada. You relieve the taxation, but unlike us, you don't completely relieve it. All of the treaties here have positive rates of withholding on interest, dividends, and royalties, which we do not have. It seems to me that these are defensive documents. From my perspective I don't see any substantial problem with any of them, frankly.