This is an old joke, but a good one. Modern emacs has full colour graphics,a window manager, a decent browser, evil makes editing possible for people with ten fingers or less...

I (and many others) have been thinking about a system that boots to Emacs. With the guile backend we might get enough speed to make it tolerable fulltime.

The only thing missing (and I bet somebody has done this too) is a way to run graphical ELF binaries with an embedded X/Wayland type thing.