I'm on the island and don't see this happening right now...the locals are not receptive to additional seagoing vessels and the construction of a pier would probably not be well recieved. The Superferry battle is still ongoing and it's gotten ugly between both sides and even between islands.
The piers at Aloha Tower are more than 1/2 hour away from Ko'olina. Probably closer to 45 mins, depending on traffic. (which has gotten HORRIBLE)
I can't see another pier getting built there either. A few of the existing pier/ports in the islands have long needed to be repaired/replaced and even this is not being approved because of the negative impact it will cause on the ocean. Disney was able to build this way in the Bahamas because they don't have the same environmental protection restrictions we do.
There is no way the dredging that needs to take place can be done under the current restrictions that exist. The same thing happened with the Long Beach port plans, will happen in Hawaii. It will get scratched. Sorry, us planet huggers are big ole fun suckers.