All across the Valley, the majority of big start-ups are actually glorified distribution companies that are trying, in some sense, to copy what Domino’s Pizza mastered in the 1980s when it delivered a hot pie to your door in 30 minutes or less. Uber, Lyft, Sidecar, Luxe, Amazon Fresh, Google Express, TaskRabbit, Postmates, Instacart, SpoonRocket, Caviar, DoorDash, Munchery, Sprig, Washio, and Shyp, among others, are really just using algorithms to deliver things, or services, to places as quickly as possible. Or maybe it’s simpler than that. As one technologist overheard and posted on Twitter, “SF tech culture is focused on solving one problem: What is my mother no longer doing for me?”
— Is Silicon Valley in Another Tech Bubble? | Vanity Fair
Nick Bilton nails the problems in the Valley, and this is just one of a whole holy host of quotable sections. That said, Dave Pell is on to something too, if you need a TL;DR version.