My trained eye can't tell if it is worn out but I'm fairly certain a new build fuselage would be a safer option than taking apart a heavily modified Comet 4 structure and trying to fly it for another thirty years......
However if BAE says that's a good idea then great. I used to work for them when they had great ideas like the Jetstream 41 and the world beating engineering joke that was the ATP. Let's not forget the world class 146 program and er......yes that's about it really.