Another commodity that is going to go away soon is helium! (Fun fact of the day).
I feel that should chocolate go extinct, the human trafficking wouldn't stop. It will just go to less delicious outcomes. People will always exploit people. It has been human nature for millenia. The people who do it know what they are doing is wrong so telling them it is wrong won't help much. The only way to do things nowadays is to vote with your wallet sadly. Which sucks for things where there are no alternatives.
Human trafficking has been growing for years as economic conditions make people more vulnerable to exploitation. Do you think that most people would be able to make the connection between that and inequality growth or would it be too difficult for them?
I think people are aware that lower economic conditions cause exploitation. I also believe that some people intentionally surpress people's economic condition for their personal gain through exploitations of legal systems and economic mechanism.