We went involuntarily car-free for a month after a heavy rain flooded my family's car. It was much more manageable than expected, due to both the walkability of our suburban neighbourhood and commutes that aligned with nearby bus routes. But if we lived even 1km further from the bus stops, it would have been unpleasant. The alternatives to driving need to exist with reasonable frequency before more suburbanites consider ditching their cars. But I also believe that people need to be receptive to trying something different that may not always be as comfortable as getting into a climate controlled, sound insulated private box to get around.
Despite how close we are to amenities, almost everyone drives to the grocery stores or to work regardless of age or physical health. One factor is 30+ minute bus headways even at peak times. Another is that 2+ buses are needed to get to the nearest commuter rail station, which has free parking and again 30+ minute headways. So to make it to the station on time, people just choose to drive there. That lack of integration with regional rail schedules is another thing that may be limiting bus ridership. An interim solution to low built densities affecting bus routes is more bike infrastructure that is transit compatible, like bike racks at bus stops instead of awkwardly using utility poles. (Also, why are we not allowed to use both bus bike rack slots when they clearly have the space for it? It seems asinine.)
While we are not really a car-lite household, many grocery and commuting trips have been replaced by transit. I realize there's a degree of discomfort that comes with a change in travel patterns when the alternatives are not as maturely developed. Waiting 30 minutes for a bus or walking 20 minutes to another bus route because the last bus came early can be unpleasant, but on the flip side, the ride itself unlocks the ability to relax or get work done that driving does not permit. Walking or biking to the grocery store can be a workout on the way back, but it's free cardio through 'the gym of life,' as Jason Slaughter of Not Just Bikes would say. We need to be okay with some discomfort before ridership can increase enough to improve transit frequencies. Or, you know, hope that 40% increases in gas prices in 2 weeks is enough of a price shock that people start embracing the alternatives on their own accord.