The most wonderful thing would be of course if AC Transit restored the most important part of the Key System network: the Transbay route. I imagine that it would be cheaper than building a new BART tunnel, and given that the current one is already at capacity, something will have to be done about it sooner or later. A streetcar system, especially with a transbay route, could be very beneficial for Oakland, especially if the city agrees to greatly increase density along the lines and reduce car-dependent uses, for example by allowing supermarkets and other stores with minimal parking. It could provide a nice relief and make Oakland the most affordable and pleasant place to live in the Bay Area.

Or, how about a bike lane across the Bay Bridge? At least in Marin I can ride to the City across the GG.