Call me cynical, but I believe this is cyclical.
Kids grow up in boring suburbia, grow up, want excitement, move to the city, have kids, look at schools and neighbors, and fuck off to the suburbs with nice schools and big front yards.
Or, kids grow up in the city, crave some peace and quiet, move to suburbia, have kids, their kids get bored, move to the city... etc.
Add to that some general population trends and what's-hot-today trends, and I wouldn't be surprised to see plenty of talk about building public transportation today, and building better-connected suburbia in x years...
With that said, I'm interested to see what role tech plays. Car sharing schemes already give a lot of city dwellers go-anywhere freedom without needing to own a car, stuff like that.