That hasn’t actually been a goal for 50 years. That was a “maybe if this is really successful we’ll do it” vision in the early days of BART planning.
Extend to downtown San Jose? Maybe a goal for 20 years from now. Add additional transbay tubes? Sure, if the tooth fairy pays for it. The electorate emphatically does not want to pay for more BART, much as I’d like it to be otherwise.
Even worse. They're so self aware of their own incompetence they know it's pure luck if they can pull it off. My overall point still stands they can barely ring it around the bay they definitely won't be able to build a single geothermal plant in Yellowstone.
How come in other countries you get a much nicer train and you don't need the tooth fairy to pay for it? Rhetorical question.