I don't think the Broccoli's own the rights to every Bond story. The story to Thunderball I think was stuck in litigation for years, and another production company did the film as 'Never Say Never Again.'
Cage has clout: get the rights to Thunderball and show the Broccoli's you can do it better.
Though I really think the Bond franchise should be shelved for 25-30 years, it's just too stale.
Especially considering communists, anarchists, and Islamonazis are not considered leading threats in the new world of Jimmy Bond.
That, and a license to kill is now considered a violation of human rights (unless you are aborting babies).