I was a bit curious as to the choice of the title until you explained what a walkaway was - the Ayn Rand quote made perfect sense then for this modern John Galt group of individuals.
This book sounds absolutely fascinating. I tend to look for sci-fi movies that tackle these kind of questions and leave my reading in the theology and business camps. I am looking for this title to read through now.
I was unhappy with how dark the story is--too realistic!--but nonetheless found the subject matter compelling...