I think Tom Radulovich hits the nail on the head with the basic tenants of this post. Infill stations are a no brainer, especially where suggested and core capacity and operating should be addressed. Don't forget to check all the rosy ridership assumptions at the door. However I don't think we can just sit and rest on our laurels. We need to find ways to build in greater capacity within Oakland, San Francisco and to a certain degree San Jose so people don't rely on thier cars as much. And while there are several BRT lines on the books, that is not going to be enough to deal with the rising tide of need. The longer term needs to be considered right now including that second tube and more urban extensions. Currently the plan calls for that tube, but more and more outward extensions are planned, meaning more and more funding will go to places that shouldn't get it. It's an export of our tax dollars to elsewhere and a practice that should be rectified.
San Francisco should have built a true Metro long ago and I still believe that is one of the major things this city can do to enhance existing service and get people out of thier cars (There are also a million little things that should be happening as we speak) As other cities have shown, 10,000 passengers per mile is possible with greater network connectivity. If we have core rapid transit within San Francisco and Oakland with quality bus and trams as redundancies and networks, there's no reason why we can't get a million more trips a day. Sure that might sound like a daunting number, but we need to look into the future of what is needed.
When my grandmother was born, there were still streetcars in every major city and very little automobile traffic. In her lifetime, there has been a huge change. Systems such as BART and WMATA have been constructed and the region has invested billions in its highway systems. We CAN invest in our future again. There's no reason why another Great Society Subway can't be constructed. And for those who say we don't have the money or that we're asking for the impossible, take a look at yourself and ask why that is.
You can call me a dreamer or an ivory tower thinker. Worse things have happened. But I'd hate to look back and see some kid like me drawing fantasy lines on a map and wishing that we would have invested in his generation, instead of just thinking of ourselves and our own defecits of imagination. If we listened to the same types of people that said no then, we wouldn't have a BART or Muni system to worry about now. Imagine San Francisco without rapid transit at all.
While we might not be able to plan and construct Metros right now, we can start to think about how a better region can emerge from our planning. Just because we don't have money now doesn't mean we should toss out these ideas or shouldn't plan for them. It just means we need to incubate them, for that point in the future when they should bloom.