&gt; <i>Part of the challenge is that PasS platforms have quite a bit of vendor lock in.</i><p>Cloud Foundry is an installable opensource PaaS. You can use a hosted version or set up your own on AWS, Azure, OpenStack and I forget what else.<p>&gt; <i>I can foresee the growth of do-it-yourself PaaS, built on Docker, Kubernetes, etc.</i><p>RedHat are packaging these for OpenShift Origin.<p>Disclaimer: I work for Pivotal, which is the major donor of engineering effort to Cloud Foundry.