Does anyone else here think PS4K is Sony's play at captivating the "Spirit" of PC gaming? Whether people like to admit it or not, there is a modest group of people who are leaving the console confines and entering the PC space. I built my first PC in nearly 7 years with a 280X, and I never thought I'd do it. My biggest motivation? Better fidelity.
It's unfair to call these machines glorified PC's, but they share a lot of DNA with the PC arena, and it would be a pretty good idea to adopt the practices of iterative hardware because it could demotivate consumers that are on the fence about PC gaming.
I also see this as an opportunity to answer Microsoft's UWP initiative. Microsoft is creating an ecosystem where platform agnosticism is the rule. All boxes behave like PCs, load up an app, and scale performanc depending on what configuration the user has. For all the flak MS received for the poorly designed Xbox One, this might be their ticket back onto the bus of the mainstream conscience. PS4K- however, could signal a new era where PlayStation titles begin to scale and become more "PC" like. The biggest difference though is Sony could offer more secure upgrade paths and "modest" life spans. IE releasing a new machine every 4 or so years.