"Many who will ride will get rid of a second car"

That's another lie the city wants you to believe.   The rail is a limited 20 mile line.   It doesn't even go to UH Manoa, which is the root of Oahu's traffic problems.     Only if you are lucky to live next to a rail station and work near a rail station will you be likely to use a car less often.

People in Mililani, Wahiawa, West Kapolei, Nanakuli, Maile, Waianae and Makaha others will still have to drive to a train station and only Pearl Highlands and a few others will have parking.  

The rail is going to make commute times loner for many, possibly most people.