why not? i think there is not much ppl out there who wants to do the job, an we know that viktor comes back.
rowling had said about him: "in the far future he will be back"
then why not as a teacher. durmstronge's pupils were always good at the subject, having karkarroff at large in their school.

ps. bill not charlie was the head boy. charlie was Quaidditch captain.
pss. i know i spelled Quaidditch wrong.
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Who says that the plot won't take us to somewhere in the eastern block if that is where Krum is.

But I've got a sneaky suspicion that Krum might go to some lengths to get close to Hermione. He was quite taken by her. So I guess we can't rule the Krum theory out just yet.