Maybe they should connect from BART to the LA subway system.
Not going all the way into either SF or LA should make for a lower cost system.
an interesting and possibly good idea, does have some advantages.... but... also...
1. Bart and LA trains have very serious problems right now (especially Bart, which is as close to complete breakdown as is possible while still operating) and
2. SF and LA political power brokers are very strong in Democratic (California) big project deal-making and super-sized graft matters... and they might not like it unless the bullet trains “serve” SF and LA