A mobile interface for Emacs will be killer. I heard about Orgazly and tried using it but it's a very slow interface. A mobile first design even with limited features will go a long way.

Mobileorg was that app for a while but it's development stopped and it's no longer usable.

Agreed. Don't forget about tablets too; I'd happily pay for someone to make Emacs usable with touch gestures and optimized for touch use (e.g. with a clickable, context-aware button row).

I'm waiting for Emacs to run natively on ChromeOS (or Android) so I can get a Chromebook. (I'm not willing to install Cruton or any of the native Linux hacks on a chromebook).

For Android, Emacs 26.1 is available in Termux. I can confirm it works on my phone. No rooting required.

Thanks for this. Trying now. I always assumed this was some form of SSH/Mosh client.