I think there are two things to consider. One would be that, by returning to the old legislation, I think a lot of the concerns about the regulatory or red tape burden would not be realized, in part because the Navigation Protection Act in its current form no longer triggers the Canadian Environmental Assessment Act, so you would not necessarily get the duplication question around environmental assessment. You could continue forward with a more robust federal oversight on waterways without actually impacting the degree to which you have to do lengthy or duplicate environmental assessments.
Alternatively, one option would be to have a sort of backwards triggering mechanism whereby any environmental assessment that occurs throughout Canada would trigger a review through the Navigation Protection Act specifically regarding navigability. This would probably keep the overall regulatory burden down relative to the previous model.