Smart mirrors are nothing new but are not yet accessible to most people!
This inaccessibility is mainly down to initial cost of the screen and raspberry pi but also from a technical aspect. Although very powerful and awesome projects such as MagicMirror exist, they are not easy to use or set up for less technically experienced users.
Develop a software base that can be used in traditional smart mirrors eg: rasberry pi based, but is designed with inexpensive tablets in mind such as the fire tablets from amazon. Having this simplified hardware means a touch-friendly framework
User friendly set-up and use of the mirror in terms of widget configuration, placement and interaction.