It seems that Leaf should have a 4th picked out no matter what happened to the previous one. The 3rd will have to be replaced sooner or later (if he gets killed or retires) so who do you think it should be?

The frog hermit probably wouldn't do it, Kakashi isn't really Hokage style, so I'd have to say the head of Hyuga or maybe Anko, though that curse seal seems like it could still be trouble. What do you think?