again you are not thinking clearly.  while rails allows the westside a traffic free mass transit, the tods that will be planned will benefit most of the island, especially where they don't want additional development in their areas, such as Hawaii kai, Kaneohe, Kailua, north shore, etc.  hence, further housing developments will be concentrated along the urban corridor and not disturb those areas who do not want more development..  so your argument that rail is only for the westside is totally wrong.