You are missing the point. Computers/laptops/netbooks/smartphones/tablets are all converging. In the future, I expect smartphones to be the computer of choice based on their portable form factor. You would then plug it into various terminals (car, home, work etc) to display on a larger screen and possibly gain other capabilities.

Even in your own post you provide two real world examples of this: the Atrix with its netbook dock and the Optimus with its 1080p-out capability. This is only the beginning - more numerous and powerful use cases will emerge within the next 5 years.

As these capabilities expand, processors must match the pace to power larger displays and more complex interfaces. So as long as manufacturers can increase processing power without significant issues with heat and/or battery life it is smart business to continue to push the boundaries in smartphone CPUs.