Boiling the frog may be a good analogy, although it suffers from a bit from having nothing to do with automobiles.
Apple, and 10.10 is going slower and is more nuanced than Microsoft and Windows 8. You have to change these things slowly, test some concepts, polish things - rather than just jump in and announced HI, I'M NEW, OH, YOUR NOT A TABLET? SORRY! (Metro, I'm trying NOT to look at you).
Clearly, everyone is trying for seamless integration of phones / tablets / desktops / clouds. Some good and some bad will come of this, of course. At least with 10.10, things are quite a bit more subtle and Apple has finally moved a few (just a few) degrees from 'my way or the highway' in that there is more customization of UI elements in 10.10 than has been seen in any version of OS X. You can still use an iPhone with a Windows desktop and and a Windows phone with OS X should you desire. The walled garden has a few open gates yet.
As to what will happen in the future, no one knows. Apple ain't saying and I really don't think Microsoft has any idea.....