To be honest, I don't think so, or rather I don't want admin themes to be a thing. One of the things I love about WordPress is that the front end is unique, but all the back ends are the same.

Right now devs are putting theme options all over the place, and only some are actually using the theme customizer. Imagine if admin themes become the norm, if devs tie-up admin themes into their frontend themes, things can get crazy.