I'm a little confused by what you're saying, but here's what I see: in the not-too-distant future, we will carry around our "phone" which will actually be the "head" of our computing system. it will have plenty of local storage which we won't necessarily need as most things will be cloud-connected (I think I just read that some chip manufacturer had just achieved a terabyte on a square inch), and the processor will be ample enough for nearly any computing job that most people and businesses will need. at home, I walk to my desk where there is a large monitor and wireless keyboard/pad and I don't even need to take the phone out of my pocket. the same is true for work, or Starbucks... big screens on the wall, keyboards, all connect wirelessly to my phone. add in a headset, SIRI, etc., and sure, the "phone" could be implanted in my arm.
there will always be a need for larger, "main-frame" type computers, but a separate desktop won't be necessary.
it will be sooner than you think. and I should add, I certainly don't think any of this is my original idea, I'm no seer.
