Survivorman unfortunately went off the air and he is filming a new series on Animal Planet, and will be working on some new survival series and a new book.
Apparently there were more people that wanted the excitement and gross factor in MvW and not enough people that wanted to see real survival methods.
Survivorman's competition with MvW was not the only reason. Actually surviving all the time was taking a harsh toll on his body. It is kind of hard to stay healthy when you really do what you say you are doing.