There is little need for more power and performance if software and internet demands stayed the same. They don't. Software continually grows more complex and demanding on computer resources. The demand for more performance in phones, pads and PCs will always continue.
How much performance users will get on their smartphones and tablets will be determined by the frontrunners in this space, Apple and Samsung, both of which have in house ARM chip development. If Intel comes out with a chip with far better performance than what Apple or Samsung offer, the added value of that performance will get downplayed because there isn't a marquee device that is showcasing it. Based on past trends, its unlikely Intel chip will have higher performance in any case. Building volumes from third place (at best) to fill up extra fabs is a tall order even for a company as efficient as Intel.
Khitchdee believes that humans will never need a device that has more performance that the iphone5. He along with CEO Warren East believe that the human race has reached its technological peak.
I talked to a guy last night that was with a large group that we were with for a birthday party. He was playing with his Iphone 5 and I asked him how he liked it. His EXACT words were "it freezes up on me, I wish there were better phones as I'd get one. I could care less about Apple."