Nice idea, but what about the 24, 32 and 64 channel mixers? Would 64 level meters fit to the touchscreen? On all consoles, input channels have a three-segment LED level meter, indicating incoming signals (prefade) and peaks. Isn't that enough visual control? Or if you use a tablet, what about the Meter Display Mode (System Settings -> Device Mode)? You can not only WATCH all inputs and outputs, you can also MUTE them, if needed.
Just saying. Next comes the "Thank you for..." and the votes. Good luck!