I am not familiar with the history of hiker/biker dedicated camping sites, but it has the smell of a public policy initiative (i.e. provide an incentive to exercise) rather than a way to promote tourism (or to keep the ranger busy). The obesity crisis is real, and costly, and any tool that may be used to get people to burn calories and get fit is worth considering.

Back to the OP -- it might make sense to suggest that Canada Parks take some inspiration from the NPS. If I am not mistaken, the more visible initiative is the Canada Trail project, which is essentially focused on getting the trail done. It WOULD make a difference for me if I knew that the trail was equipped with hike/bike sites at "reasonable" intervals.