The cameras have kinda made a comeback because the airplanes are so bloody huge it helps while taxiing, so they figured why not pipe it into the IFE because it truly is an awesome view. As far as auto-disabling in an incident, I doubt there is a system that specifically disables the tail cam connection to the IFE, but of course the purser or pilots can disable IFE in its entirety at any time. Assuming an emergency is not dire, disabling IFE is likely on a checklist that the purser would be following.
As recent as 2005 when that JetBlue had the sideways gear going into LAX, the passengers were watching it live on DirecTV. Purser had hours to shut it off, too. Whoops.
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