yes, of course I want that, for the reason that accessing shared data via a cloud is ludicrously slow, unreliable, fraught with security concerns, and doesn't bring application state with it.
I "work around" application state to a great extent with Xmarks (lets me open remote tabs) and screen, but it's a kludge compared to always having my main computing device in my pocket, ready to connect to any screen and keyboard to just keep working. Imagine hotels offering HDMI input to TV's + a keyboard so I don't have to use my "small" 17" laptop screen. Or internet cafees where I can "bring my own machine" with all my own applications and data.
I don't see how multiple devices is a "much better design" when we're always carrying one device around with us anyway. It's incredibly wasteful. Devices augmenting it with additional functionality, sure.
The only things holding back the smartphone as "the one" main computing device for most people is performance and capacity. Of course there will always be a need for more powerful machines for some niches, an there'll always be a need for e.g. laptop shells (and for "real" laptops too).
But for an increasing number of users, the power of a smartphone is rapidly exceeding what they need from a laptop or desktop computer, and then it becomes increasingly appealing to springing for a higher capacity smartphone if it can double as our main computer "just" with the addition of a "laptop shell" or screen + keyboard.
Keep in mind the PC desktop and laptop market has stagnated - average prices are low because the typical non-Mac PC user opts for low end models because they no longer see a need for the performance bump of the higher end models.
The performance a typical PC user wants, and the performance possible with mobile technology will soon intersect.