You also can't blame families for moving to the sprawling burbs so they can have a house. People love living inner city, but get sick of living in crammed, tight, eco-friendly condos. I live inner city, but was fortunate enough to get a house before prices skyrocketed here. Before I moved here, I lived in a condo in Burnaby and really hated the thing. I would have a few people over for a supper and we would be jammed packed.
Usually when couples have kids and want a little more breathing room. Reality is, burbs will happen. So the best option is to plan that sprawl as best as you can.