In before about 50 posts that are basically "solution in search of a problem" and "what's the point"...
Jobs: "a mobile phone, an iPod and an internet communicator." That was 3 distinct products we generally owned at the time that was being merged into one thing. We didn't question the point or the purpose, or have trouble imagining problems iPhone could solve. We could "think different" and appreciate 3 becoming 1.
"an iPhone and an iPad, as a single product." That can be 2 distinct products we generally own now that can be merged into one thing. If we try, we can still "think different" and appreciate 2 becoming 1. Use smaller screen when it best serves some purpose. Use bigger screen when it serves some purpose... exactly like we use iPhone vs. iPad now. Else, we carry around 2 things that are largely the same thing, running the same apps, that mostly differ only by size of screen.
When Apple gets around to releasing their cut of one of these, all who see no point can stick with the "as is." It's likely the others who might enjoy 2-in-1 utility that Apple might sell.