No, we shouldn't. Caltrain shows that even the best transit systems are not comfortable for daily commutes.

The upper limit for comfortable commutes is 30 minutes one way. Even assuming that you synchronize your schedule with Caltrain departures, the map of locations within this timeframe would look like a string of rather small beads along the Caltrain route.

As a simpler example, try playing with routes from the Salesforce Tower. You start blowing past that 30-minute mark by the time the train is still passing Brisbane.