Even though PS4's APU is weak compared to high end desktops, console buyers aren't going to be that interested in shelling out over $700, and subsidizing a high end rig is going to result in some ungodly expensive games.
Because the consoles are standardized, that means the developers can extra more performance than a PC with similar hardware, since there are at least hundreds or thousands of different hardware+software combinations to program for.
The APU's 8 eight cores also allows the games to be ported to PC, with native 8-core support. That means four cores without HT is no longer the top of the line. An quad i7 with HT, or even a hexacore is more worth buying for gaming.
Since the APU also has HSA support, GPU computing would also become increasingly used, which is what Intel does not want. Nividia may also face an uphill battle with their reluctance to support HSA because of CUDA.
Also, the APU's GPU performance is between a 7850 and 7870. I wouldn't call that weak.
I recall trying an A8 or A10 laptop. It was surprising to be able to play games at medium settings at a bargain price of $600. However, I didn't buy it since I only need a new laptop in the summer since my current laptop has slightly better performance (though has much worse battery life overall), and that's when mobile Richland laptops should be coming out.
I also recall trying to game on Intel HD 2000. Never again. And going with Intel + discrete mobile GPU would cost more than an APU setup.
Edited by A Bad Day - 3/2/13 at 9:30am