I think what is going to happen is that iOS will become the future operating system and OS X will be phased out. With every new version of iOS, they continue to add more and more features from OS X. They take baby steps so as not to offend anyone and get too many people upset. But in a few more years, I suspect the difference between the two will be so close that they will be able to retire OS X and just offer iOS on notebooks and desktops, and then you will see a touch MacBook (if that is what it is even called).