I think a frequent ferry service should be enough if it runs every 8 minutes during peak periods and every 15 minutes after that (every 30 minutes late-night).
If there is demand for a second Transbay tunnel, then we can talk about rail transit to Treasure Island.
In the long term, I could also see a reallocation of lane space on the Bay Bridge, turning the lower deck into two tracks/three eastbound lanes, with the upper deck becoming three westbound lanes and two reversibles.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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