Owning a car is very expensive and out of reach of fair number of people. Even driving a modest economy car, between parking ($150 monthly downtown in my city) , my car loan ($200 mo.) and good insurance ($200ish mo.) + gas ($60ish) means I'm out $600+ of income. That's $7200 yearly without maintenance. That's as much as many people's rent in many places. I'm privileged enough that I can afford this without seriously impacting my lifestyle, and I have a sinking suspicion that if more millennials could, they'd also be car owners/drivers. With the average income per person, at $26,000, owning car is nearly out of reach.
However, I suppose I shouldn't look the gift horse in the mouth. Giving more mass transit options for work is certainly a good thing.