I understand the way
@DesertPenguin09 is reacting. It's not how I feel, but that's one of the two sides of the fence to be on. Be happy he went out on top, or feel like he's running away.
There have been numerous others who retired after winning the big one. Most recently being Payton Manning. It may be the biggest moment in that persons life, or at least in their sporting career. Being in that position will make you pause and think if there is anything more to achieve. Certainly Rosberg could come back and try to win another, since he is young and obviously at the top of his craft. But, as he stated in the presser (I just wanted to use that word), he had a single minded goal of winning the World Drivers Championship for as long as he can remember. Finally achieving that is a huge sigh of relief.
The fact that he states that he wants to be there more for his family really shows the kind of person he is. I've never been a fan of his, but after reading that and watching the homemade video of him karting as a youngster, it makes me realize that he understands there is more to life than racing.
I recently watched the movie, "The Gambler". Without giving the movie away, the phrase used by John Goodman, "...be in a position of **** Y**". Rosberg is certainly in that position and I'm sure he'd love to that tell Lewis Hamilton.