Don't underestimate the amount of people doing things wrong.
Docker could be much more successful in the Windows world, the ability to package very precise versions of databases, libraries, weird obsolete application into one image that can be deployed easily would be extremely helpful in many companies. It would be the wrong solution, but an easy work-around for broken upgrade paths.
As a Windows admin, this sounds like a recipe for disaster. My networks are already getting crowded with Appliances and Appliance VMs that are provided to us as black boxes, and we have to depend on a 3rd party for security patches and a durable security implementation.
Having containers able to package weird obsolete (unpatched) applications, specific (out-of-date) versions of libraries, and poorly-written homespun code is a recipe for exploits. The out-of-date version of the library (e.g. Java 7) likely has exploits out in the wild that have been patched in more recent versions. The weird obsolete application (e.g. DTS) likely not only has exploits patched in the active codepath, but has multiple bugs and integration issues. The homespun code likely reimplements something done better in another application or library, and introduces more bugs and vulnerabilities to the network.
Sorry for going off on this, but being able to repackage unsupportable applications would be a nightmare in places I've worked before.
Docker could be much more successful in the Windows world, the ability to package very precise versions of databases, libraries, weird obsolete application into one image that can be deployed easily would be extremely helpful in many companies. It would be the wrong solution, but an easy work-around for broken upgrade paths.