[jeffFrom18F]

I'd say far from perfectly feasible. I looked at the prospect of commuting from South Bay into San Francisco. In isolation a "Baby Bullet" sounds feasible, (45-60 mins), but there are only so many of those, and they of course don't drop you at the door of your office. So the end result looked something like showing up to the station at 7 AM to get on a standing room only train, then needing to cobble together the rest of your commute via bike/rent-a-scooter/Uber whatever to show up anywhere reasonably close to 9. Then doing the reverse on the way back!