I'm sorry, but I don't see that as having anything to do with merging the two.
Apple could maintain the app store, and continue to have open software sales for everything else. There's no reason why that wouldn't work just fine.
But the advantages to merging the two are tremendous. One guy here started by saying; "I can't imagine...". That's right HE can't imagine, but I, and others can. There are just so many ways this could work.
Most people thought the mouse was a waste of time. My god, it took your fingers off the keyboard! That was sacrilege! You could do much better by memorizing hundreds of two and three letter combos. Why would you need drop down menus? That was just for beginners, not for experienced users.
This is all such a crock! Touch has so many advantages it's difficult to know where to start telling them. I can say one thing though. With proper design, touch is much faster than a mouse, and more accurate too.