Above is a powerpoint from Culver City on the Expo Line’s impacts on bus ridership. The bottom line: there has definitely been an uptick in ridership since the Expo Line’s first phase fully opened in June 2012.
Equally interesting, there is also some information on potential expansion of bus service to serve Expo Line riders — i.e. bus service between Playa Vista and the Expo Line. Intriguing, for sure.