Multiple investigations in the past have recovered data from FDR and/or CVR after an extensive high-temperature fire. I do not think that FAA will give that requirement up.
Yes. As I said. The existing system can remain in place, with all of its existing high-temperature-tolerant components.
In addition to not giving up that requirement, we could also add a longer, not-heat-tolerant storage. If it gets destroyed in a fire, see the above paragraph. If there is an incident where the data is of interest and the aircraft is not destroyed in a fire, then this will maintain the data long after the above system has deleted it.
No one has advocated giving up the high temperate storage.
In addition to not giving up that requirement, we could also add a longer, not-heat-tolerant storage. If it gets destroyed in a fire, see the above paragraph. If there is an incident where the data is of interest and the aircraft is not destroyed in a fire, then this will maintain the data long after the above system has deleted it.
No one has advocated giving up the high temperate storage.