I think the main difficulty is simply related to the definition of “Canadian production”.
Let's take the example of the movie Jusqu'au déclin, which was shot in Lantier, in the Laurentians, and was written and directed by a Quebecker, with an all-Quebec film crew and whose entire cast from Quebec. A project like that does not qualify as a Canadian production, since Netflix financed it entirely.
So it's not only about the percentage, but also about what the percentage would be based on. Specifically, the items that were supposed to accompany Bill C-10, which we are awaiting and which the government has indicated as the policy directive or direction to the CRTC, could contain a revision of the parameters that qualify content as “Canadian”.