James,
Your case is well stated. Urban “green space” has a long history, and is considered essential for the “health” (including mental health) for urban populations. As you know, I’ve had to privilege of biking along the river. I can’t imagine the city NOT wanting to keep/reclaim this area. It is clear that these 22 km won’t “destroy” the ecosystem, and my very well enhance it. I hope the fine people of London, Ontario rebuild the dam while being as ecologically conscious as possible.
Mark