Are we seeing the last lions?

According to the article "Are we seeing the last lions?", lions, tigers, and leopards are facing many threats for survival. I believe that without them there will be a change in their food chain. Without them another primary consumer will have to show up or smaller animals will start to overpopulate. I agree that extinction of lions would cause many problems. "Just 50 years ago there were 450,000; today there are possibly as few as 20,000." (Are we seeing the last lions?). I think we sould form an organization to help the big cat population stay up. The article cites authority by quoting the findings of Beverly and Dereck Joubert to convince us that we need to save the big cats.