Tech is unique in the job market in that it's much easier to move up the value chain relative to other types of jobs. There is very much a tech underclass of easily-replaced workers. As time goes on, more and more of these sectors become commodified. IT workers used to be really highly paid, now they're replaceable. PHP was once in high demand, now it's only a little better than being a IT worker.

The question here is whether there will always be a sector for tech workers to move to where they can easily leverage themselves a seat at the table. I find it hard to believe that it'll suddenly go away anytime soon.