It will be nice to have audio and video devices map, and allow users to draw wires from one device to another. Changing wires will route sound and voice. Also we can add cameras here with picture in picture. At the beginning it will be hard to find such hardware, but HA can update hardware for example for passing HDMI using lan. Such devices now very cheap. And also it is easy to pass audio. So make next level entertainment system, and also connect push notifications for all video and maybe audio devices, to take all home video at control.
Also, it will be nice here to have AI helper for next source.