Yep. It's chicken and egg problem. You have to invest so heavily before reaching a tipping point of it being a realistic alternative to cars for most American's. Only at that point does it make sense. Where as with cars, we've already made much of that investment. I know it has a high maintenance, economic, and ecologic burden but that's not what we've optimized for. We've optimized for complete freedom and autonomy of movement. We have a number of light rail lines in my city. They mean nothing to the vast majority of our citizens because they either live too far or work too far. And by too far, I mean that proverbial last mile. The other problem is they're not always direct. Just like air travel, this adds time to your trip. People are willing to accept it on air travel because it's rather uncommon, but when your daily commute could be 20 minutes by car or 45 minutes by rail most people will drive. Not to mention, the run times are commonly every 20-30 minutes and are not always consistently running on time. This means even if you plan your day perfectly, a single round trip could leave you sitting for up to an hour at the rail stops just waiting on top of your 45 minute travel time. We have auto traffic, but nothing that severe. We also have sprawled significantly. The implication of which being people drive long distances to work as the status quo. With transportation, long distances means more stops and longer travel time. When driving, most people's commutes see an extra 10-30% of time than non-rush times. But it's fairly predictable and much quicker than trying to get to rail.

All that is also ignoring the other big items: weather & culture. I'm in Dallas, although this applies to many southern cities, where people most people are not used to the weather. Going to speak broadly, this applies to a vast majority of folks. They leave their HVAC home to their HVAC car to their HVAC offices and so on. The women especially get dressed up and do their make-up and hair daily before ever being seen my a non-housemate. Men are often still dressing in clothing that they'd like to keep clean. We don't carry changes of clothes around with us or have a natural style (like I see in European cities where biking is normal). Sweating and being rained on and such is completely foreign to us. We generally wouldn't show up to work after having walked a mile outside. This is why we don't even ride bikes for transportation even when going short distances. It would require a huge shift in perspective and culture around these things.