Laptops/Desktops are dying. 10 years from now, virtually nobody will have one. Only question left is when, and how fast, the transition occurs.
My guess is within 4 years.
I dont see me ever NOT having both a laptop (or full spec Surface, which is a laptop with a touchscreen and detachable keyboard IMO, not a tablet) and a desktop, iOS, limited devices will never replace the need i have for a flexible, "run anything, Do Anything" device.
As much as apple and other companies would love to see the death of the PC and the total adoption of the walled garden device its not going to happen in my lifetime, let alone as quickly as 4 years.
Computers are here to stay, Apple is blinkered by the HUGE profits its currently making from the iPhone and iPad, but the fact is, they are turning them over too quickly, and the public is starting to feel upgrade fatigue, sure the fanboys will continue to buy every product on a 8 month or less upgrade cycle, but the man on the street is starting to be over apples "change it for changing its sake" approach to upgrades and forced obsolescence of older devices.
i would say in 4 years time its more likely to see apple slipping back into a "Niche" market as other firms continue to innovate and add new features , and apple just keeps chanting "Smaller, Lighter", without Steve Jobs, apple is no longer innovating, its just following a path to a device that is just an un-upgradable unusable piece of glass