Mark Webber said at the weekend that Rosberg had come up to him during their Williams days and said that he "didn't know if I could do this" regarding the pressure and media attention. So with an awful lot of hindsight I'm not surprised that he's quit, but nobody saw it coming!
I'm not sure how this is brave. Understandable and logical maybe, but brave? I don't see it.
I perfectly understand the desire of a family man to spend more time with his family and I totally respect and admire him for that, but brave is the wrong word.
It's not brave at all, except in the sense that he's still relatively young and undoubtedly driven, and that's going to be one heck of an itch to scratch, but he's not going to do it in F1 again given how long he's spent getting to the top of his game (which he was at this year, up until Sepang).
I admire him for taking the step though. He's got a lot more left to show people, and I would have liked to have seen him take on Hamilton next year with the knowledge he can beat him on track, but he's clearly decided he's done what he wanted to do and that's enough. He clearly didn't enjoy this year, and looking back the celebrations weren't of happy but almost of an aggressive relief.
You've always had the feeling he was ultra-driven to the point of being unhealthy to do one thing, win the title, and now he's done it he's felt a massive weight off of his shoulders, and he obviously likes that feeling.
I suppose he's very much like Mansell; not the most naturally gifted driver by a long stretch, but he never gave up and ultimately succeeded against more talented opposition. There's an awful lot to admire in that.
As for a replacement... well if Wehrlein was apparently annoyed at not getting the Force India drive over Ocon, then I can only imagine the fury he'd feel if he doesn't get the Mercedes drive. Does he have the temperent to go with it though?
I really can't see any of the stars of F1 getting it. Neither Red Bull nor Ferrari are going to let their drivers go, and with the fire having died out with Rosberg's retirement, I can't imagine Mercedes would be too excited stoking it again with Alonso (as good as that would be to see).