Honestly after these last two movies I'm a little surprised the franchise survived.
The Man with the Golden Gun really could have been the nail in the coffin. It's just a straight up horrible movie. Everything that's cliche about the 70s.
The 70's themselves were a cliche.
While Saltzman and Broccoli were making entertaining crap like Live and Let Die and The Man With the Golden Gun, the film industry was enjoying one of the most fertile periods in its history. The Godfather parts I and II, Cries and Whispers, Last Tango in Paris, Jaws, The Sting, Chinatown, The Conversation, Amarcord and Nashville were all released in the same time frame as the early Roger Bonds. The cliches came afterwards.