Re: A few comments
Ironclad said: "Plus joypads suck, keyboards and mice for teh win."
This is the key, and belongs up top, way ahead of clock speeds, cores, or polygon capacity. The 'console' as we know it is defined by a painfully 'low-bandwidth' user interface, the ubiquitous gamepad. This feeble device is the chief constraint on console gaming. It offers basic four-way directional control, and a minimal number of buttons, thereby severely restricting the human-game interaction. Witness the Sony PS4 launch, where we saw nearly photo-realistic characters jerking around like insanely detailed 3D versions of Pac-Man. Rendering just doesn't matter - there is simply no way the player can move their onscreen avatar with anything resembling real-life fluidity.
There's another point, equally important. Gamepads have the wrong TYPE of control. They control velocity, not position. Rotation, not angle. (It's a first-derivative thing, if you recall any high-school calculus). This is simply NOT the way humans think and move. When I turn to my friend, I'm rotating to THIS angle... not STARTING rotation, waiting, then STOPPING rotation. Similarly, if I aim a weapon, I don't START sweeping to the right, then STOP. I turn a few degrees right. I turn TO a given location, not AT a given rate.
Taken together, the limitations of the gamepad result in dumbed-down games. Good console games are built around those limitations, so players may not notice what's been done. But the richness and depth of a PC game like ArmA, or Flight Simulator, or Civilization, or even Battlefield, is simply not on the menu. (It's easy to think of other examples.)
Add the openness of the PC ecosystem, and the gap widens still further. The new 'social' features of the PS4 emphasize this gap, rather than narrowing it. Yes, you can press "Share." On the PC, you can connect to multiple services simultaneously. You can count on developers finding new ways to deliver games, sell games, tie games into resources that don't even exist yet. You can count on a 'mod' community inventing anything the developers miss. (And in turn spurring commercial development to new achievements.) This vibrant ecosystem will always produce faster evolution than a console monoculture.
To go back to the car analogy, it's more like the difference between a train and a helicopter. The train can switch tracks, at pre-determined points. It can go faster or slower. The helicopter can wander freely in three-space. The train is constrained by a cumbersome switching system, operated by a very limited number of corporate bodies. The helicopter can be privately owned, and hence upgraded or modified, taken 'off the grid,' to locations not served by the rail network.
Of course, even that strained comparison falls short of capturing the actual gulf we're talking about. A gulf that will continue to widen, given that the growing power of the PC will not be constrained by the human interface, while the advancing clock cycles of a PS4 or even PS5 will be increasingly wasted, as far as gameplay potential.