Looks like they gave up after settling with Intel (and some years of bad management)
To be fair Intel also abandoned their idiotic race for MHz which fixed things for them.
Maybe their investment in ARM servers may be a light at the end of the tunnel.
Every computer at a store today is fast enough for 99% of people.
The request for smaller, fancier appliances that consume less power will always be there.
Also, the world outside your PC is moving: JIT VMs in the browsers, computationally hard to decode movies, older analogue technologies moving to computers.
There will always be a request for better computers (for various meaning of "better").
Nope. Shitty laptops with 5400 rpm old hdds, 2 GB of ram and old turion/core CPUs will NEVER be "fast enough".
You're overestimating what most people do with their computers
It works well enough for what I need it to do - surf the web, Office, Facebook, Youtube, Plants vs Zombies, movies, - heck it has an HDMI port. And I've been able to do some light programming on it without trouble.
Only thing it really doesn't do is non-casual games.
Can these chips power a supercomputer? No. Do 99% of people need them to? Not at all.