Actually I have been on Austrian an Japan Airlines flights who kept the camera on for take-off and landing. I love that. Austrian even provided a choice between 2 camera feed.
Now that we can no longer spend time in the jump seat it is a feature much more appreciated than before.
On my last 2 flight to YVR (using A330) they were showing Airshow as a default screen when there was nothing else running.
Airshow is certainly a favorite for me.