I believe that Kimi joining Ferrari is the best thing that could happen for Fernando, Ferrari and ultimately us F1 viewers.
In much the same way as Nico Rosberg and Lewis Hamilton both needed a kick up the bum Fernando and Kimi both need a team mate that will motivate them. Both Kimi and Fernando are emotional characters with hidden levels of talent and ability, both will have to explore those depths in 2014 if they want to beat their team mate.
Lewis and Nico have inspired each other, if Kimi and Fernando don't inspire each other in the same way I will eat my own leg.
