Interesting post Eric. I think from the buyer's perspective it has been difficult to buy responsibly due to a lack of clear information. This is beginning to change with initiatives like the FSC (Forestry Stewardship Council) certification which is granted to producers who adhere to their strict guidelines. I think the more people consider this issue (as you have here), the more manufacturers will act responsibly for the sake of sales. Actually though, the larger manufacturers already have plenty of incentive to develop sustainable materials because they can all see just how little is left.

You might find this an interesting read:

http://www.gizmag.com/eco-friendly-guitars/11918/