I'm now of the idea that, if Sony wants to push PSVR hard and the stock PS4 wasn't enough, why not simply throw the idea of the PS4K in the PSVR? Just hear me out.
The PSVR already has the breakout box to assist w/ VR. Why not just add the CPU/GPU to the breakout box for some processing offload? Sure it's not as optimal as having all of that horsepower on one motherboard in the system, but I'm sure Sony's engineers and Mark Cerny could have come up with an attractive solution to the problems it'd present, while still getting desired performance gains. And seeing that it probably would not cost them more than $100 or so for the CPU/GPU combo, that'd keep the PSVR solo around $499 and the combo for $599, the same price as the Oculus combo.
But here's the thing: by doing that they'd now have the extra processing power for the VR they envision taking hold, and it'd all be allocated to one piece of hardware instead of two. So in essence, it doesn't spread the target demographic too thin. Now for the best VR experience you're asking for $800 (assuming PS4K is $400), $900 for those that need the bundle unit, and for what, just a bit more horsepower than the solution being proposed here? Just how exactly does that look to current PS4 owners w/ the OG systems?
Here's the other thing; PS4 as-is can handle 4K media playback just fine. So if the 4K up-rendering feature that seems to be a part of the PS4K's push is a thing, why not just aggregate that to the PSVR unit? In this way you can actually drive the PSVR even more because you're adding more value to it instead of splitting value between two products, one of which (PS4K) is redundant in this scenario. People who don't care for VR or 4K up-rendered games can get by just fine w/ regular PS4, but those who want VR and/or 4K up-rendered games and higher game fidelity can get PSVR. This gives PSVR on its own even more selling power, because the chances are likely a lot of the people who'd want PSVR would also want what the PS4K can offer, but just as likely, a lot of them are conflicted w/ the fact they could be spread thin between the two devices as they currently are.