The problem is that those decisions have to be made by the group of member states, and there are many member states who would oppose such a move, so it becomes very difficult. Whilst there are a growing number of member states who are exploring options for regulation and are keen to explore issues around treaty reform to allow those to proceed without creating these tensions, there's also a large group of member states that are very much opposed and would act as a bloc.
In the short term at least, whilst it might be worth pursuing issues of amendment or modification to show goodwill and also to make sure these issues are being actively discussed in key UN forums, they are unlikely to prove successful in the short run. That then means that, if Canada is to resolve these issues, it may have to act either unilaterally or with a group of like-minded states they can act in conjunction with.