We've probably run him into an early retirement realistically, for all those years he had to carry our forward pack almost solo.
What a career though, not too much more he could have asked for. Premiership winner, World Club Challenge winner, former 2nd row of the year, 230+ NRL games, played 16 times for his country (too few, sadly), captained his club, massively respected by most in the game (it seems). Not too much more you could hope to achieve in the NRL.
The fantasy implications are fascinating. It's probably too late to sign a big name replacement - I've already seen various suggestions on the Warriors forum of targeting Sexton, Hazleton, Neame, Whyte, Kini, E Butcher. Neame would be awesome, but it seems a long shot. Hughes is obviously the gold standard, but I don't see it. Presumably, Tohu hasn't just sprung this on management, though, so maybe they have something up their sleeve?
If it's just a matter of finding a new lock from what's already in the squad, it could conceivably be any of Walker, Clark, Barnett, Ford, JFH - some on the Warriors forum want it to be Ale but that seems unlikely. Any of Walker, Clark, Ford would present clear value. Doubt you buy JFH to play him at lock, but stranger things have happened.
Walker was playing there a lot last year, so is presumably the favourite. Clarke averages 48 in the role and shouldn't be especially expensive, so is probably the best option from a fantasy POV (unless it's Ale, but then every serious team would have a base price starting lock).