You know Charles, I see where you are coming from now, unfortunately habitat distruction is the biggest threat to populations of wildlife. What we do as hobbiest and the collecting we do for captive breeding has infinitesimal impact compared to the destruction from developement of land, which really can't be stopped without controlling the human population and that is a whole "nother' topic. I have seen some of the best wildlife habitate in my area destroyed to make golf courses, and residential, the residential is in some way needed.
With that is mind I hope you will be able to relocate populations nearby, seems like as worthy an endeavor as any.
Unfortunately captive breeding is in fact the only hope for the survival of some species or subspecies at this point.
Best of luck my friend.