That’s not the case at all. The deletion of the well dock from the LHA 6 is because of the evolution of the capability of the Gator ships in the USN’s ESG. In contemporary ESGs the LHD/LHA was usually loaded with vehicles that could all be lifted by the helos and the well dock used for LCACs. With the new LPD 17 these LCACs can now be carried closer to the shore and the LHD/LHA carry exclusively aircraft (and helo liftable vehicles). Its just further customisation of the ships based on experience.
The USMC has already stated that their mission is bigger than a single program. They will be replacing the EFV with a clean sheet design with better technology for swimming ashore. There is some very interesting stuff in the US in this area like the Fast Trac amphibians.
Is this the type of Amphibian you are talking about ?
http://www.hightech-edge.com/lockheed-martin-gibbs-develop-military-amphibians/447/
http://www.gibbslockheedamphibians.com/acc-e.php
http://www.youtube.com/watch?v=J_U5JxFD8GY
I have been reading up on these lately, very interesting
As to the ZBD 2000 this is an even bigger failure than the EFV. It can’t even plane to achieve high speed but the Chinese mass produced it anyway because they don’t have any responsible government.
The LVTP7 (aka AAV) has a marine grade aluminium hull like the M113 which doesn’t corrode and is over engineered for stress (to be armoured) so they can basically be rebuilt for long service lives by replacing everything else in them time and time again.