FRIDAY 5 AM, 2ND UPDATE: I’ve learned that Jeff Robinov’s attorney Skip Brittenham officially notified Warner Bros on Thursday that it is in breach of the movie mogul’s contract, and he wants to negotiate his exit.

THURSDAY 6 PM UPDATED THROUGHOUT… EXCLUSIVE 2:45 PM: The destabilization of once rock-solid Warner Bros continues. I’ve learned that Jeff Robinov has decided to leave as Warner Brothers Pictures Group President after months of waiting in vain for Time Warner Jeff Bewkes and Warner Bros Chairman Kevin Tsujihara to offer him a new contract when his expires in December. Robinov is on vacation in New Mexico and this week enlisted both his attorney Skip Brittenham and his friend and former Warner Bros chairman Bob Daly to negotiate his exit. Robinov’s frustration follows Bewkes and Tsujihara placing him inside the ‘cone of silence’ in recent weeks ever since the home entertainment chief was appointed as the new Warner Bros CEO and soon to be chairman. No phone calls of congratulations came from Bewkes or Tsujihara to Robinov after last weekend’s record-setting global successful opening of Man Of Steel or any of the studio’s Summer 2013 big worldwide releases, The Great Gatsby and The Hangover Part III.

[EXCLUSIVE below: Ben Affleck and Baz Luhrmann reflect on their relationships with Robinov while Christopher Nolan's is detailed.]

Witnesses tell me that on the LA to NY plane trip to the Superman premiere June 10th, Tsujihara sat for the five hours not saying a word to Robinov who was sitting opposite him. This cruel behavior was in full view of not only Robinov’s execs but also of the Man Of Steel filmmakers like Christopher Nolan whom Robinov had brought to the studio. I’m told that at the Red Carpet gala at Lincoln Center’s Alice Tully Hall, which should have been his triumph, Robinov left demoralized after just 15 minutes. This, after he and Tsujihara used to be close friends who went on family vacations together. “I’m constantly being marginalized. My job is shrinking day-to-day,” Robinov confided to a pal the other day. “Kevin is starting to push me out by both the things he’s doing and the responsibilities he’s assuming. It’ll end up with everyone reporting to him. The result is that people at the studio are wondering how they can benefit from this or how they can not get hurt by this. Sitting around is not something I can do, or, by the end of the year, the studio will be in a massive mess.”

I’ve learned that the structure being contemplated for Warner Bros Pictures is not for any one person to replace Robinov, who was a rarity in recent Hollywood in that he did both the business and creative top job at a studio. Instead, his Warner Bros Pictures executives Sue Kroll, President of Worldwide Marketing; Dan Fellman, President of Domestic Distribution; and Greg Silverman, President of Production, would run the studio as a triumvirate under Tsujihara who will take over the business side even though he has no such movie experience. It is unclear if New Line’s Toby Emmerich will have any new role within this structure. Also unclear is how this affects what was supposed to be Kroll’s imminent promotion adding Worldwide Distribution to her duties, especially if Fellman retired when his contract is up in 18 months. Both Kroll and Emmerich separately and alone had been tipped for Robinov’s job in recent months. Both have denied this. Emmerich’s star began to fall after the last 3 of New Line’s 4 releases sank this spring like Jack the Giant Slayer and The Incredible Burt Wonderstone on top of last year’s Rock Of Ages.

Robinov is the second very successful Warner Bros mogul who shared power as a triumvirate with Tsujihara and now has been pushed to quit in anger and sorrow: Warner Bros Television topper Bruce Rosenblum also was a target of Tsujihara’s humiliating war of silence. Although Tsujihara lied to insiders and outsiders that Rosenblum was staying, he brutally shoved him out the door after 10 days of negotiations. Like Rosenblum, the biggest knock in the Hollywood community against Robinov was personality – in Jeff’s case, always mercurial, at times harsh, often asocial, but also insecure and even sweet when the occasion called for it. He has never been beloved, but then very few moguls are because the vast majority of their job consists of saying ‘no’ not ‘yes’ especially when making the business decisions.