I collect watches, many of them divers. Those seals probably need to be changed every so often. The all dry, harden and crack.
I have divers watches as well from Rolex and Breitling. The seals only need to be replaced when the watches are serviced, which is every 4 to 5 years or longer. The difference of course is that, unlike a divers watch, these cameras are never submerged and are not under the pressure of 20 to 150 atmospheres. The seals will last the life of the camera.