Yes, we had that discussion:social-f1/deforesation-issue-indonesia-africa-and-the-djembe-t3346-15.html#p22738
Djembe's are a problem in the sense that they locally deplete the traditional species. (There are probably still plenty of lenke trees left in areas where people don't
make djembes.) And I suspect that, if someone wants firewood, they don't really care whether the tree they chop down is a species that's used for djembes or not. All the other uses for wood, particularly as firewood and building materials would still be the larger problem.