I'm not going to take a side, but just to answer a part of your comment on "species that just disappeared" as, apparently, an argument for saying humans might n

I'm not going to take a side, but just to answer a part of your comment on "species that just disappeared" as, apparently, an argument for saying humans might not have adapted to their new diet. Obviously, humans have not disappeared - quite the contrary in fact - therefore they either have adapted to their new diet, or were already suited for it.