Traffic likely will never get better at LAX because once you remove certain vehicles (e.g. rental car shuttles) from the ring road the excessive road capacity will be immediately filled by other vehicles currently avoiding that road. That's why highway and road expansion like the $1.5 billion I-405 widening a few years ago to "relive congestion" is a fools errand and wasted investment. The only way to relive congestion on ANY roadway is to properly charge for access - you need to levy a congestion charge (toll) to use the road if you want it to always be free flowing and easily accessible.

What the peoplemover will do is to provide alternative to people accessing the central terminal area (CTA) by vehicles, and that is a genuine access improvement. The vehicle access point now expands to the 3 peoplemover terminals outside the airport ring road, plus any of the Metro stations that can offer relative painless transfers to the peoplemover at the 96th street station. The whole point is to offer easy alternatives for you to get dropped off or picked up beyond the LAX CTA perimeter. The is no current alternative except by foot. Whether you drive, uber, rental car, taxi, or take the FlyAway or Metro, all involve getting on or off a vehicle inside the CTA ring road.