'Need" a desktop? How about 'want' the desktop? I much prefer relaxing in my comfy desk chair with the 21" monitor rather than squinting to read lines on a 4.5" display. Nor am I comfortable trying to type out a msg on a keyboard with keys so much smaller than my fingers! Nor do I know anyone who would have to contact me for anything that can't wait until I am at home rather than on the road...that's why we have an answering machine. Put me on the keeping the desktop side of the ledger.
Now, I do own a cell phone - but not a smart phone. I only carry it for emergency purposes - like taking a photo of any accident that might come my way.
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Not sure if I have free time...or if I just forgot everything I was supposed to do!