I don't think he'll play at WU. They have been stockpiling CB's so I think Dura may well be (at best) 4-5th in the pecking.
They can likely offer him more certainty in the front/back office after his playing days are formally concluded. They are looking for club leadership, of which (obviously) he can offer a bundle.
I don't blame Dura at all and in fact think it was the sensible decision for him if they only thing on offer here from the Nix was 1-2 year deal sweating on the NLWG outcome. He'll be better placed being in (not-quite) Melbourne to move on to other things.
And while we could also have done with his leadership, mentoring and continuity, I get the impression that the club recruitment/retention policy has not been too concerned with it.