But... but... no! The cast has been the same for so long and Ziva was a good character! She was pretty sane and looks like a normal person (you know, not overstyled like so many other female characters on US TV). I hope they won't kill her off, so she'll be able to come back.
And now I'm worring about her replacement. God, that woman will probably also be there as a love interest for Tony. Man, wouldn't it be awesome if she turned out to be totally not his type and Tony would be left disappointed?