I agree, too bad US providers generally don't carry Canadian networks, even as an option. Most border states do have Canadian networks (often locals from just north of the border) available via local cable systems etc, so there can't be a major legal hurtle in doing so.
There is likely a very small demand for these services though in the general US population.
With IP streaming though it should be available to most nowadays, even if you have to go through a VPN, which is not a huge deal.
I feel keeping Canadian content out of the US can lead to an impression of a secretive society, which of course is not the case.
I have noted Mexican programming on local cable networks in the southern US states, not so much up north.