A mixer similar to the Flow8 with longer range wireless control and the ability to remotely re-aquire a dropped connection would be useful. And a better power connection, and...
The flow 8 concept is so close to what I need in so many scenarios. A mixer that had several inputs and the only control on the surface would be volume sliders for each channel would be a dream. Then, all of the magic gets controlled via computer or iPad. Now, you can set something up and put it in place for inexperienced operators that have a hard enough time to be able to understand adjusting the volume of a few different things, and it's magic.