I'd note that CAN-SPAM in the United States is aptly named, because you can SPAM.
The reality is that the task force had the opportunity to look at some of those other laws. The idea that Canada should emulate a law that is universally regarded as entirely ineffective strikes me as problematic.
If anything, what we are seeing is jurisdictions moving towards stronger rules. Australia, for example, saw the spam problem that was happening locally and adopted the strongest anti-spam rules at the time. It found that, within short order, much as we've experienced with the reduction in major anti-spamming organizations, they left Australia because the penalties were so high that the risk changed their analysis of whether it made sense.
If we're thinking about whether these kinds of rules are getting tougher, just take a look at what's taking place in the European Union with the GDPR, which has far tougher privacy rules that are applied not just in the EU but around the world.