Heroku is also still vulnerable, which makes me slightly uncomfortable.
When you combine Docker, buildpacks, and CoreOS[2], you get a scalable and flexible platform that you can run anywhere. It has taken people a long time to combine the simplicity of Heroku with the flexibility of bare metal, but the open source guys have finally put all the building blocks together.
[1] https://github.com/CenturyLinkLabs/building/
[2] http://www.centurylinklabs.com/building-your-first-app-on-co...
[1]: http://deis.io/
[2]: https://github.com/opdemand/deis/issues/530
[3]: http://docs.deis.io/en/latest/developer/dockerfile/#deploy-u...