As great a driver as Lewis is, I just don't see him and Ferrari being a winning combination.
First things first, there is no reason for Lewis to move or Mercedes to drop Lewis as long as they are winning. I think, some of Hamilton's fans should be very grateful to Mercedes for this opportunity because Lewis' talent was being wasted at McLaren.
Secondly, Ferrari have had a splendid 2015, but that's not a sure shot mantra for future success. I'll be very surprised if Ferrari compete for the title(s) in 2016. May be 2017, but that's another set of rules and I'm 50/50 on that.
Lastly, Vettel and Hamilton is a recipe for disaster. I'm a Vettel fan and while Hamilton is more outspoken and emotional, I have no doubt Vettel can be 'disruptive' as well. It's just the nature of the beast. If there is room for only one person on the boat and there are two passengers, one has to drown and Vettel is no saint. He might not be as political as Alonso/Hamilton, but he doesn't take too kindly to losing.
Like I said on the other topic as well, Rosberg and Hamilton are one of the best pairings I've seen in F1 and Mercedes will be mad to let go. I have a very strong feeling that if they do drop Rosberg, Ferrari WILL sign him. I'm equally sure they won't sign Hamilton even if he's a free agent.
"Sebastian there's very, you're a member of a very select few.. Stewart, Lauda, Piquet, Senna, Prost, Schumacher, Fangio.. VETTEL!"