1. They should convince company with $$$ such as Google, FB, Apple to build this for building between their campus buildings.
Those company has $ and regulation issues might be might a lot smaller compare to convincing a city like SF to do it.
Might be easier to sell because of the "cool factor".
Those companies can easily convince City of Mountain View, Sunnyvale, Cupertino to let them do it.
2. If #1 works, those companies can build routes between the public transit hub, large shopping malls to company.
Help ease the parking/commute issues.3. Convince Disney Land, World to do this for the "cool factor".
4. All Major convention centers, sport stadium to build routes to major shopping mall/large parking structures nearby.