No, Hawaii has and is still the headquarters of all of the military forces in the Pacific, all orders on a tactical level are routed from Hawaii.
Furthermore, I am confident that Hawaii still has a few land based ICBMs left, not to mention Hawaii is the home port of the US Navy's SLBM fleet.
Consequently, Hawaii remains a vital strategic target that will most likely be eliminated should WWIII begin.
I agree, but it still does not negate why Hawaii is a top-five strategic target in the Pacific Theater for the reasons listed above.
Kuleana
I'm not sure what you know about the missions of Headquarters units, but their primary objectives are to train and equip organizations so they can be used by theater commanders if/when needed. Depending on location or event, the commanders will be on a command ship, carrier, or ground command center.
For example, when 5th and 7th fleets deploy to the Persian Gulf, they are under the command of CENTCOM in Bahrain, Saudi Arabia. Each Component Commander (Army, Navy Air Force & Marine) would report to the Theater Commander.
Taking out a Headquarters unit does not cripple the operational units under that command. The worst that could happen would be a loss of communications if NCTAMS in Wahiawa were taken out, which would then be replaced by retasking the satellites to route communications to bases in CA.
Where exactly are the Hawaii land-based ICBMs? I don't think there are any. Any missiles we have are sea-based, purely defensive or for testing at PMRF at Barking Sands, Kauai.
As mentioned, the fleets don't reside at Pearl for long. The SLBM Fleet is at sea for months at a time and rotate in port for maintenance, resupply and shore duty. Taking out one or two subs is not a mission-critical concern.