[usaar333]

Bart to SFO provided a valuable connection from Western SF/Daly City to Caltrain/SFO. It also provides the actual only connection between Caltrain and BART, giving better connectivity to the East Bay.

[hedora]

Yes, but replace either BART or Caltrain with the other one, and the system would be strictly better than it is today.

For one thing, it would cut 15-30 minutes of travel time between Silicon Valley and SFO, and Silicon Valley and Oakland.