I'm surprised by all the negative comments about this. It's hard for me to understand why this is a bad thing. Linking the phone to the computer in deeper ways without having to write separate apps seems _super_ valuable.
Now a company with Apple's resources should surely be able to reintegrate the Cocoa Touch hard-fork back into a common modernised Cocoa, which by now has a 30 year legacy from NeXTSTEP.
Naturally you'll still need to customize a UI for Mac or iPhone but a unified toolkit is entirely possible.