A lot of the show was about Charlie, back in the flesh in the prequel before the very episode of the series, which took up about half of this farewell episode. The other half is what happens to our team in the aftermath of Charlie's death.
Everyone lands on their feet, some even promoted. Is that realistic? I don't know - I've never been part of a news team - but it felt right for this series. As far as personal relationships go, everyone also landed on their feet, and, given the frustrated love that animated so much of the series until now, these happy endings seemed realistic, too, part of the universe righting the balance in favor of some happiness.
Jim and Maggie will stay together with a long-distance relationship - but not that long-distance, given the proximity of New York and Washington - while Jim's promoted to MacKenzie's job and Maggie may be on her way to the job of her dreams. Don and Sloan are finally happily together also, with neither getting a promotion. And Will and MacKenzie are having a baby, as MacKenzie is getting promoted to Charlie's position.
Too much happiness? Hey, these characters are entitled to it, not only after all the unrequited love they've endured, but the often gruesome nature of the news they were daily obliged to cover. And we the audience deserve it, too, as a remembrance of a show the likes of which have never been seen on television before, and not likely to be any time soon, again.
analysis of the first two seasons
See also The Newsroom 3.1: Media on Media ... The Newsroom 3.2: Ethics in High Relief ... The Newsroom 3.3: Journalism at the Barricades ... The Newsroom 3.4: McLuhanesque "Books Are Like the New Art"... The Newsroom 3.5: Penultimate Prescient
And see also The Newsroom Season 2 Debuts on Occupy Wall Street and More ... and (about Trayvon Martin) If Only There Was a Video Recording ... The Newsroom 2.2: The Power of Video ... The Newsroom 2.7: Autopsy of a Bad Decision ... The Newsroom 2.8: The Course of True Love ... The Newsroom Season 2 Finale: Love, Triumph, and Wikipedia
And see also The Newsroom and McLuhan ... The Newsroom and The Hour ...The Newsroom Season 1 Finale: The Lost Voice Mail
a little news in this story too