Go on then, how the heck WOULD you have ended it??
I love the whole film and the last two scenes (Daniel with H.W. and the interpreter and then, of course, what's probably known as the 'milkshake' scene) are unbelievably brilliant. 'Bastard from a basket!' The acting is maybe better in the adult H.W. scene than the last scene, there's so much going on with the characters and yet at the same time nothing. Daniel is one of the greatest screen creations.
One of my favourite lines in the last scene is when Daniel shouts 'I told you I would eat you!' because you then realise that that's what he must have whispered to him earlier on in the church'. I think killing Eli is the only way to end it because, like he says, he's 'finished', there's nothing more.