[comex]

A few things:

Neither system's encryption has been cracked yet.

Both systems have "hUMA", where the GPU and CPU have a coherent view of memory (at least on the "Onion" bus) and the former can even page fault. This likely makes them rather difficult to emulate properly on computers that don't have similar AMD cards, and I think AMD hasn't even properly exposed APIs for this for those cards on PC.

And, of course, writing something like Wine is a huge amount of work.

But it's definitely possible.

[wlesieutre]

Also worth pointing out that while AMD does have PC hardware with hUMA (Kaveri series APUs), the unified memory pool only exists when you're using the integrated graphics processor. If you hook up a discrete GPU (which most gamers do) you get two separate memory pools that are in a unified address space, but don't have the magical consistency benefits that hUMA can give a CPU+GPU working on the same data. Not my area of expertise, but I doubt that kind of setup will help with PS4/XBOne emulation.

For drivers, proper support for hUMA isn't available yet on PC. There's some pretty recent information on AnandTech: http://www.anandtech.com/show/7825/amd-updates-driver-roadma...