Spoiler (obviously) but trying not to give away too much, I'm sure the rule in question is that the hero is meant to live happily ever after.
Except that never applied to Bond; any time he seemed to be about to have some semblance of a normal life terrible stuff happens to him and/or his loved one(s).
an event happens that terminates the series for good.
though I bet in 4 years the producers will change their mind and retcon the series back to life.
Current Hollywood would just start remaking them. No time/budget for new scripts.
The movie ended with "James Bond will return". There's not even an implied end of the series. They pretty proudly showed off that it was continuing.