Just like it says on the tin. How do we reach this goal? What are the effects of this change? Does San Francisco annex neighboring municipalities like LA? Do the sizes of other cities change as a result? What is the effect of this on California state politics?
Geography unfortunately is against you on that. The main areas that would likely see urban annexation; Oakland, Marin, and the Peninsula, are all either separated by water (in the case of Oakland and Marin) and the Peninsula up until the last sixty years or so was largely farmland up until you hit San Jose. Unlike Chicago or LA where you had several towns and cities in close proximity much of the urban areas of the Bay, up until the 1930s, were divided by geography and divergent interests. Los Angeles, by contrast, sits in the middle of a huge, easily traversed valley with lots of room to grow. This meant economic, social, and political interests had much more benefit from unification of services, government, and the like than they did from division. It helps that up until they scrapped the streetcar system it was
much faster and easier to get from one side of LA to the other than it was to get from San Francisco to Oakland, Marin, or San Jose.