Actually a laptop cannot provide near the power of a desktop. There is a huge market for PCs and many of the chips/gpus that are developed for PCs are modified for use in laptops. So yes, although many individuals may prize laptops, there is still a huge (and I do mean huge!) market for PCs. You simply do not have the speed, versatility, and application of a laptop that could remotely compare to a PC.
3d gaming, video editing, programming, huge monitors, dual monitors, ease of input devices, stand alone webcams, durability, customization... the list goes on forever. And with more needing to access the internet than ever before, the population growing, and the wealth gap (esp. in America) widening--there will be an even greater need to make affordable processors, motherboards, and the desktops they power.
Read the former CEO of AMD's book. It should clear up a lot of misconceptions you hold for this company.