All the sea level rise can happen in just 6 hours with hurricane storm surge, or in just 6 minutes with a major tsunami. All are widely predicted by FEMA, NOAA, SOEST scientists. It's coming and people just don't seem to realize how very much on the edge "normal" life really is on Oahu. They will be finding out. It took decades for Kauai to recover from hurricane Iniki.
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The City certainly could care less that the Sand Island WWTP is just a few feet above sea level and will be wiped out by a major hurricane or tsunami. Can people in Honolulu even image what it will be like to have to use Porta-Potties for six months to a year minimum? Electricity cut off for weeks? A very rude natural disaster awakening is coming and will happen well before the worst sea level rise happens. But the City certainly isn't planning for it. 
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The City is planning rail stations and Transit Oriented Development right along the Honolulu shore lines where the worst coming natural disasters will happen.