Apple is extremely tight lipped on what they're doing and where they're going, they will support and then drop some technology on an apparent whim. I've had serious issues when they dropped WebObjects, Java as a first class Cocoa development language, and now moving to Swift seems like a message that all my work in Objective C will be thrown away by Apple. The promise of ZFS on OS X made me buy a Mac Pro, and then several months later they just dropped all mention of ZFS on OS X.
I'm not going to stick with a company which is so secretive about what they are going to do, failing to even publish roadmaps for their customers and developers. Mindshare among the tech geeks is how OS X took off. Now they're losing it - many developers I know are moving away from the platform too.