Mmmmmmeh. Some truth, some hyperbole.
It's true that some genres are migrating almost entirely to the console. It's also true that a mouse-and-keyboard layout tends to be superior for first-person shooters, but they've adapted the controls to the console well enough that the players of those games don't feel they're getting a lesser experience (unless they have to play against people who are playing on mouse-and-keyboard...) And yes, we'll probably come to a point where many people don't even think of the mouse-and-keyboard when playing an FPS.
That said, those "pointing devices" aren't showing any sign of replacing a mouse in terms of utility. Seriously- can you imagine trying to select a single unit in an real-time strategy game like Shogun or Starcraft with a Wiimote? Nightmare.
It's also somewhat peculiar to fail to note the role of piracy in all of this. The "pick up and play" nature of consoles- which I'm certainly not knocking- also means that a lot of the console's market wouldn't know how to pirate a new game if they wanted to and is beholden to someone else to hack their system or provide some obscure hardware doodad if they do want to, steps that are comparatively easy for the console maker or console-software-maker to block on a case-by-case basis. PC gamers have a relatively easy path to piracy and most have the small amount of knowledge that would enable them to do so, so the legitimate market for PC games is much more dependent on PC gamers behaving with a certain amount of decency, maturity, and a long-term view of the health of the industry. Annnnd.... Not to put too fine a point on it, we've sort of seen how that's going.
Small point: casting tablets and laptops as somehow separate from PCs begs the question of whether a PC is defined by its stationary nature. Yes, my Alienware laptop is something I can carry with me, but it plays exactly the same software as Monolith, my big honking black aluminum beast of a desktop.
And while XBLA's expansion and Steam coming to PS3 are notable and in some ways commendable, the PC remains the easiest entry point for new game creators by far. No licensing, no content restrictions, no clunky platforms to obtain, no size restrictions.
I guess what I'm saying is in some ways what MovieBob is also saying under the flame-baiting headline: PC gaming isn't dead by a long shot, but it may well be changing into something very different from what its most vehement defenders easily recognize. More social gaming, more independent devs, less AAA-releases, but I don't see MMOs or RTSs going away any time soon, and TellTale does plenty of business outside of the Wii, thank ye kindly.
The real question is what's going to happen when the next real generation of consoles come out. The PC has been a much more powerful creature than the current gen of consoles for some time. Seriously. Is the next generation going to be able to create an experience that console gamers will want to move on to at a price they'll be willing to pay? Or are we holding our breath, trying to forestall another huge market crash?