The narrow minded innovative hipsters who try to "disrupt" are cute, I remember being like that in my 20s. I'm almost 40 now, with small kids and let me tell you. I have no energy to even care about anything. I need a big car to fit all the family and our junk. I need to move from point A to B with the least disruption possible. Preferably with the kids asleep in the car seats. I really really don't care about anything else. And sure as hell I won't trade my sanity for hopping public transportation and extending my trip by a few hours to appease some eco friendly conscious 20-something hipsters who have all the time in the world to do their meaningless self-serving I-want-to-feel-good-about-myself-and-the-world bullshit. Especially when my kids are sick with fever screaming bloody murder.
So no, living in the city or in the suburbs, parents wont trade their SUV and Vans any time soon. But be my guest, you singles do it. Ultra-lights are not "the only" viable future. I rode a bike and subway all my teens and 20s. And you should too, so the parents can ride their tanks and not end up in mental hospitals. And our species can continue.