Klinenberg's revelation is that, rather than worry about this increased atomization making a nation of shut-in brats, we should see this as a neutral or even ultimately positive thing because these singletons are healthy, happy, and engaged. Indeed one of the book's big goals is to dispel myths and assumptions about people who choose to be alone. In support the book rallies scores of miniature profiles of singletons, quoting and amassing their differing and converging impressions and reasons. These mini bios also try and humanize the subject, to make flesh and blood out of a growing mass of loners.
The book's message is inherently anti-climactic: Hey, this is happening but it's OK (as long as we govern accordingly). I guess this is why I found the book so dull.