+1. If the transportation goes where people need to go when they need to go there, they will use if. If it complicates people's schedules to use public transit and does not compensate in time or money, no one will use it.
I live in Massachusetts, but unfortunately I don't commute into or out of Boston, but along I-495 (one of the major loops around Metro Boston). I've done a lot of homework on public transportation commute options and they all suck. There are lots of train or subway options to get into or out of Boston radially, but nothing directly along the I-495 corridor. Some buses run that route, but they are not cost effective and the schedules don't usually align with my work schedule. I teach so I absolutely have to make it in by class time, so reliability is a problem.
On paper I *could* take trains to where I work, but I'd have to take one into Boston (~1 hr), get off and switch to a different line (~30 min, maybe less, maybe more), and take another train out to my destination (~1 hr 30 min). 6 hrs daily commute by train if I was so inclined. And I'd be at the mercy of the infrequent but not uncommon delays.
My commute by car is 35 minutes one way, all highway. With gas and maintenance (not counting my time), the cost is less than paying the train fare. Ride share options are not great as there are few other businesses near where I work. Bus is an occasionally possible option, but the schedule conflicts with my teaching and the cost is no better than driving myself. Bike is a no-go because of the distance and winter.
I would give away my car in a heartbeat if there was a sensible alternative to get to work, but there simply isn't one.