Whether it fails at the terminal or the rod itself is immaterial. A failure is a failure. Dye testing will not show all the flaws and even an experienced rigger more often than not cannot tell when a failure is likely. If a boat has been stored with the mast up here in the Toronto area and raced every Wednesday night for the last 25yrs. I sure wouln't take it offshore and salt water just increases the risk. While it is immensely strong it gives almost no pre-indication of spectacular failure. Common sense will tell you that nothing lasts for ever and several million cyclic loads cannot help but hasten the end of rod rigging.
Dirt People Scare me