This is low key kind of wild, when you consider all the implications.
Brady is going from being the most famous player to ever play the game to a new role: either the most famous of the ownership collective, aside from Jerry who will be dead in a few years; or the most famous of the media side of the game. Both are opportunties to represent the league and basically be the face of the sport--but both are totally different politically. As an owner, he'd be the one with mics in front of his face at ownership meetings, and everything Raider related. As a broadcaster though, he'd be a PR man for the league on a weekly basis. He has to pick what he wants, and what ultimately furthers his aims.
Think of the comparables to Brady in other sports: MJ (Hornets); Tiger (just given equity in the tour); Jeter (Marlins); Gretzky (Coyotes). Equity in the game seems like a natural path for someoe of his stature, while broadcasting only opens him up to criticism. He signed the broadcasting deal when he was still playing football, and going through a divorce. Based on the legend around him, I doubt he devoted much time to weighing broadcasting vs ownership against one another. But now being out of the game and talking to his peers about it, I bet he'd rather be an owner than a talker. People are just waiting to pick apart his every word.
This is his team releasing this news, and by team I mean the other owners. No access to production meetings? He's never going to call a game. NFL and FOX will quietly work something out behind the scenes, and he'll do some media shyt with Beli this year on MNF to publicly bury the hatchet, and make it look like he's not running scared from the cameras. Manningcast is a convienient way to bypass the production meeting aspect, because he can just show up as a "guest" every so often--Peyton was his biggest rival and Beli was his coach, Eli was his foil in 2 Super Bowls. Fox gets to keep Olsen in the booth as their number 1, who America genuinely seems to like. Everyone wins and the biggest winner of the day is the NFL.