Just out of curiosity, are all of the Flight Control Computers located in the same physical place on FBW aircraft, such as the A320 ? In my job (IT), it's best practice to have redundancy of not just data, but of the hardware - including having the failover system in a different location.
If there were a fire in the avionics bay, severe enough to take out all computers in there, is there any chance the A320 could still remain flyable ? I know there's no cable system so I suppose I've answered my own question haven't I ?