Surface Book is deluded? Tim, you'd sell a lot more of these iPad Pros if users were able to run OS X on it and pair a mouse with it. Better yet, let the iPad Pro run OS X and also run iOS apps. Best of both worlds, but then Apple would probably charge $1,299 minimum for it.
Honestly if Apple sold a Pro that could run both OSX and iOS $1,299 would be both an amazing feat and price and I bet they'll get there within 5 years. Even now I'm confident Apple will smoke the sales of the Surface Book.