"Because the Internet has been around a lot longer than these agile principles, I argue that the real catalyst for the startups and technology disruptors we see nowadays was the widespread, affordable availability of cloud resources. The chance of deploying infrastructure on demand without long-term commitments, anywhere in the world, and with an option to scale it up and down on the fly decreased the cost of innovation dramatically."
Deploy or Die via SoftLayer Blog
And we would take it one more step and say that mobile and the app paradigm was the accelerator. Everything prior, from the Internet, to API’s, to the cloud all helped lead us to this point, and now mobile is the Trojan horse that has infiltrated the corporate structure and upended the normal order of things. Now the disruption is happening everywhere and it is all available and controlled from your smartphone ad tablet.