Why do trains work well in many European countries? When there's farmland between stations (or even between some bus stops in the city where I currently live), it means that because you normally want to go somewhere that's not farmland, you're very likely to want to go somewhere near a station. The density around specific points (train stations, bus/tram plazas, etc.) is particularly high which makes the last-mile or last-kilometer problem largely a non-issue.
If you build this in the LA metro area, it might serve the people who live very close to stations well, but everyone else who lives somewhere in the middle between two stations (which would be a higher percentage than people living in European farmland) would need to find a way to get home from the station.