When OSX and iOS merge, there won't be any options other than the App Store. Might as well bite the bullet and make the necessary revisions, or just decide to abandon the Apple market.
http://fortune.com/2015/10/13/apple-merge-ios-os-x/
(They also said they would not launch a small tablet and so on...)
We know it's not happening because Tim Cook has explicitly said so. Additionally, it doesn't make financial or engineering or UX sense.
Mac OS X and laptop and desktop hardware will become more and more of a distraction. We've seen them stagnating already. As a unix, Mac OS X is a rather elderly BSD.
They may keep a laptop device in the mix, but it will be more like a chromebook and run iOS.
Again, I'm speculating.
[Citation needed]