It got sold that way because of CA's slightly weird proposition system.
There's no real political willpower for transit in California as a state; it's all located in some of the cities, which are plodding along relatively slowly but consistently (the San Diego Trolley is miles more than it was 20 years ago).
i.e. A modest version with a negligible risk of boondoggle would likely never have gotten enough attention in Sacramento to make it out of committee.