Following through on major events is an issue with both DC AND Marvel. DC hasen't even BEGAN to give a good estimation of the world after Final Crisis and Marvel just sucks ass at showing the world after and event.
Dark Reign is more than likely the best we're gonna get with that. It's not a singular big EVENT like an invasion or a war it's an administration.
Osbourne is a lot smarter than people give him credit for. As nutbar crazy as he is, he's also a brillaint scientist AND an amazing bullshitter and dickhead. All combined he's basically the perfect man for this event.
Norman knows how to play people, Colbert and Stewart could never touch him because he has resources far beyond our President. Not in terms of pure power, but in plausible deneyability. He;s sneaky but in a way that is impossible to pin down. You can call him out but he can easily outtalk you and then have you secretly killed.