We watched the San Diego Trolley from the outset. San Ysidro to Downtown in the beginning. We thought it a mess. 35 years later is has wormed throughout the metropolitan area. Is it a success? Is it worth the yearly maintenance costs? I don't know. The things I do know. There was massive resistance to it. No group could file enough lawsuits to get it stopped. Look at it now. 
I foresee the rail going from Makaha to Sandy Beach in 35 years. With spurs to Haleiwa, Ewa and MCBH.  Take a look at San Diego maps from 1980 to 2015. That is what will happen to Oahu. You will see Sea World, Disneyland, Casinos, Cruise ship ports, new horse tracks, stadium(s), auto race tracks, observatories. Dillingham Airport will be the north shore international airport. Campbell field would be the southwest field and Honolulu Intl would be relocated to Wheeler so they can wall off the waterfront all around the island. This rail idea is how it starts....San Diego proves it. See you when I'm 95!