Peter Jackson did want to make the Hobbit. At first he said he was tired of doing Tolkein but then in an article on Coming Soon, he said he tried to get the rights to make The Hobbit. However the Tolkein family will not grant him the rights. PJ said the movie was mired up in red tape and he gave up on the idea.
I could be wrong but I really don't think we need a 3rd version of King Kong. Personally I thought the first 2 were stupid. We are talking gorillas here folks. The gentle giants that are almost extinct, getting the hots over a female human.