Gaming consoles were never "PCs", and if anything are "Pre-PC". They are not intended to run general-purpose software, be used in a workstation environment, or have wildly flexible hardware configurations. Rather, they are intended to run entertainment software, live with the TV, and have homogeneous hardware.
This last point is perhaps the most critical. Every PlayStation 3 is essentially identical. While Sony has made revisions, they have mostly been a repackaging to reduce costs, with no impact to interfaces, compatibility, or performance. New accessories have come out, but they are available to all users, regardless of the version. A PlayStation 3 purchased years ago on lauch day will work just as well as one purchased today. Finally, a PlayStation 3 is not an update to the PlayStation 2, nor will the PlayStation 4 be a "better" PlayStation 3. The are successors in terms of the branding and the user experience, but they are discreet products.
(This has always been true of consoles. Sure, Nintendo has evolved their architecture and kept backward compatibility. You could argue that a Wii U is a "better" Wii, however, it is intended to play a whole new set of games that are impossible to play on the old Wii, and will not really affect the experience of playing an older game on the new hardware. New box, new games. OK, the OUYA project is planning to have annual upgrades, but this has not yet happened...)
With PC gaming, the world is very different. The hardware is extermely diverse; rarely are two players using identical machines. The upgrade cycle is driven by improving the quality of the existing software, not gaining access to new software. Highly competitive gamers will upgrade their hardware to gain an advantage.
Frankly, I think a smartphone is much more PC-like than a console. New phones are "better" versions of the old phones. new phones will run all the old apps, and new apps should run on somewhat older phones. The CPUs, GPUs, screen resolutions, etc. have all changed in ways that are intended to give the user an improved experience even with the old apps. In the Android and Windows Phone worlds, the hardware is made by many different manufacturers and is wildly diverse, but still runs pretty much the same software.
True, even sony said they have a "PC-like" architecture, centered around an x86 processor, lots of RAM, a beefy GPU, and a hard drive. This does not make it a PC. These are all very appropriate choices for a console application: pixel-pushing horsepower and storage, and in drawing developers already familiar with designing for PCs or wanting to produce cross-platform.