See, if all of you that expressed interest in this idea instead actually took the caltrain, the bart, and the samtrans buses and whatever local bus lines there are, then the companies operating those would see that there is increased demand, and the increased revenues would go to making the system better.
There are already people around whose job it is to handle the messy details of moving groups of people around the valley, why make yet another company in parallell?
What annoyed me the most when I tried the public transportation in the valley is how fractured it is, there's lots of different companies, no unified payment method, no unified ticketing system, no unified timetables, no unified maps, etc. Figuring out how to get from point A to point B is really hard because there's no coordination at all.
And into this mess you want to introduce yet another form of transportation? Madness.