Hi Moss,
You can watch Ascending the Giants on YouTube.
The problem that I see with recreational climbing in SOME of the western forests, particularly the rainforests, is that there are so many sensitive canopy organisms (epiphytes). Many of the fern mats, moss mats, and lichens that grow in the crowns of rainforest trees are centuries old, yet only tenuously attached to their host trees. One carelessly-placed rope or boot can permanently destroy these creatures and the biodiversity that they themselves support. Of course I speak only for myself here, but this my reason for hoping for restrictions on recreational climbing in old-growth western rainforests.
That said, there are plenty of trees in the west, such as giant Sequoia, which support very few epiphytes... and they are spectacular to climb...
~MEA