Don't forget that, as a former two time host of the modern Olympics, L.A. already HAS most of the infrastructure in place. Some of it needs a touchup or some TLC but it's all basically in place already.
The same hue and cry about a nightmare was raised over the 1984 games.
I was there.
No nightmare...in fact, things ran so smoothly that Angelenos were shocked and almost wished we could have them all year round, so that people would cooperate more.
Even the TRAFFIC behaved!