Regardless of people’s opinion on the App Store and the iPhone you can’t deny that it has had a huge impact on Mac development in general. When I started out roughly four years ago I was utterly frustrated when I found out how few people were doing Mac development. There were hardly any books (except for outdated ones) and very few good resources except for Apple’s own documentation.
Now however I see new books being published all the time and the internet is flooded with questions and answers about both Cocoa and Cocoa Touch development.
You can’t dislike that.