By far the biggest issue would be graphics drivers, I think.

Of course, you don't need to write the whole thing. Both parts (XBox 360 and PS4) are at least similar to existing Radeon GCN parts, and we have good quality open source Radeon drivers which outperform the closed ones.

If you want to run PC executables on PS4 and Xbox One (Xbox 360 has been made well before GCN, it's an AMD VLIW (R300 perhaps?) so I figure you mean Xbox One) you can probably make drivers from the Radeon drivers. However it does not help with running PS4/X1 executables on PC in any way other than knowing a bit about underlying hardware.

My brain scrambled while trying to write One. I have trouble keeping the names straight because they called the XBox Three the XBox One. I meant the new XBox.

I think I maybe misunderstood which way nejenendn was talking about. I thought nejenendn was referring to the difficulty of running Linux on a PS4/XBox One.

Sorry, i was speculating on running xbox one and ps4 executables on the desktopp. Assumably microsoft would add support for xbox executables in this scenario. I don’t see Sony ever doing that; we’d need something like wine, or an actual emulator/dynamic recompiler.