Does the hull choice really mean that much at all? Apart for size and weight margins does it really dictate anything else? The selection of systems to fit within the hull seems like a much more important decisions to me.
Calling a hull design a dead end is a bit of a stretch, its far more important that the systems we select aren't dead ends.
Different hullforms do indeed perform differently. Of course the systems fitout has a larger role in most case, the hull everything gets packed into is important.
One of the British frigates, either the Type 21 or Type 23 (I forget which design) has been noted as being particularly quiet in the water. Part of the reason is that the design was to have an ASW focus, so that steps were taken to reduce the amount of radiated noise from the vessel, to improve the performance of sonars which would be used to hunt for subs.
Now a great hullform will not make up for a poor choice in machinery/mounting, but everything else being equal, one hullform can be better for ASW, one for speed, another for fuel efficiency, another for launching/recovery of smallcraft, etc.
Given the AAD focus of the AWD, a 'quiet' hull would not matter so much. However, if the follow-on frigate to replace the
ANZAC-class is likely to have a greater emphasis on ASW, then IMO the design should get every potential advantage possible. To my way of thinking, this means a quiet hull and machinery setup, capacity for two helicopters, hull-mounted and towed sonar arrays, ship-mounted LWT's, and VLS sized to launch ASROC and the follow-on, in addition to the regular frigate features for GP operations.
As for Australian naval shipbuilding... If I had the option, I would place an order for a 4th AWD (likely too late by now...) which would provide a batch of 4 AWD's in service, and might, just might, shave a year or two off the shipbuilding Valley of Death. That might be enough time to either bring the frigate replacement programme forward, or an OPV/OCV build programme. In either case, the vessels should be ordered in lots of four.
As for resuming construction of large vessels in Australia... I have to ask if there is really going to be sufficient need to justify investing in the infrastructure necessary to do so? AFAIK there is at present no operational dockyard in Australia large enough to build a vessel on the scale of a desired AOR or LHD.
-Cheers