A game console based on emulators and ports can be really interesting even before adding non-free software.
For starters, you may be able to find public domain or even free software ROM for most of the emulators, and they could even be shipped with the device operating system as part of the free software included! Users looking for a device to play classic games will of course download what they want, but that base set of games will be there, pre-installed, free, and legal. [PD Roms](http://pdroms.de/) [Community Software]( https://archive.org/details/open_source_software)
RetroPie has an interesting project they call [Ports](https://github.com/ retropie/RetroPie-Setup/wiki/Ports). Some of the engines and games they are porting are free software.
Lastly, it could be really helpful to provide a platform target for free software games developers. I'd guess that a device that can run/test games written in [Godot](https://godotengine.org/), , or Pygame would be rather attractive.
-- Eric Duhamel http://www.noxbanners.net/