What we need are screens, keyboards, and trackpads. For this reason, laptops will stick around for quite some time. My phone cannot replace my laptop. However, before long, keyboards and trackpads will be the surface in front of you. Then you will only need a screen. But, rather than carry around a screen, screens will be all about, and you won't be tethered to any one. Your PC will be on you wrist. You will be able to tap on that little screen, but when you need to get something done, you'll find a screen, and start tapping on the surface next to it.
I already resent the space my phone takes up, and its limited utility.