Silicon Valley is a bubble waiting to burst. You have to get massive loans from "angels", a staff of leadership ready to pocket a sizable chuck of that with stock options, and finally an enthusiastic mob of people willing to work 40-80 hour weeks only to have more fodder to add to their resume.

I suppose that exploiting a massive underclass has always been sustainable, but once transparency blows wide open it's hard to say what will transpire from there.