If you look at the technology and form factor of the MacBook Air and the new iPad, you might be lead to believe that in terms of computational power they actually merge in perhaps as little as 2-3 years time. You end up with a tablet that can run Final Cut Pro X on an external display via Thunderbolt, or possibly even wirelessly via AirPlay or some iteration thereof. Launchpad even looks like an iOS launcher for the Mac.
I suspect that Mac OS X and iOS merge at some point, possibly not too far out. It may be a lot sooner than anyone expects. There could even be an iOS 7 / OS X 11 announcement a year from now.
My expectations has always been that apple tablets and notebooks will eventually be merged into an offering simliar to the Asus Transformer Prime.
Basically a high powered tablet with an optimal keyboard docking station for additional life and features.
If we hit that bull's eye, the rest of the dominoes will fall like a house of cards. Checkmate.