"In the future, machines will be made up of four -- or five or six -- modules. So if something breaks, you will get a CRU [customer-replaceable unit] sent to you," predicts Brendan Keegan, president of Worldwide TechServices, a provider of outsourced service technicians to major high-tech companies. Replacing a CRU will be about as hard as playing with Legos, he says: "If your RAM goes bad, the company might send you Module No. 6 to replace the RAM and a couple of other things. You pop the old one out and pop the new one in. And you are done."
MB, CPU, RAM, PSU, Hard Drive(s) and Graphic card - six modules, user replaceable. You've got broken RAM - we can send you a new one, which you can replace yourself without any soldering.
For less advanced - bigger units - Central Unit, Display Unit, Alphanumeric Input Unit, Pointing Device Unit. Sometimes Printing & Scanning Unit. Just connect/disconnect cables.
We already have it for years.