SELECTION BIAS
My very own sister-in-law, Pam Postrel, contradicts me on Starbucks. (By way of backstory, she makes movie trailers.)
Must beg to differ with you on the lack of kids/strollers in Starbucks. At least here in Pasadena.
I remember remarking to friends that one weekday during my freelance life last year I found myself crowded around a Starbucks table with about five other mothers from Evie's kindergarten class planning the class Valentine's party. They came armed with dog-eared copies of Martha Stewart's Living and a bunch of other "motherhood" magazines I had never heard of, and yes, a couple of them had strollers with their younger kids in them. I, like David Frum's wife, asked in my best David Byrne voice, "How did I get here?" A far cry from studio filmmaker meetings, to be sure.
Also when freelancing, I found myself incapable of working in my office due to the distraction of the internet, and so worked in Starbucks frequently. As there's a Starbucks a stone's throw literally in every direction from my house, I found myself in a variety of them and there were often moms and babies in them, along with the Cal Tech and Fuller Seminary students.
I guess I just frequent the wrong Starbucks. But even in Plano, the moms are in the mall and the Starbucks is full of men in business attire (some of whom appear to be looking for jobs).