A rare miss, Bob, a rare miss...
As far as the consoles vs. PC thing, I don't see one ever overtaking the other. As powerful and versatile as consoles could undoubtedly get, their main appeal is and will remain accessibility. Un-box, plug it in, start up your game, and go. There's enough of a market to keep that going for decades. PCs, on the other hand, require much more assembly and tinkering, but the extra power and versatility ensure that there will remain a large market for that as well. I do foresee an interesting possibility though, that at some point consoles may become general, multi-purpose machines (filling the function of a modern PC), while PCs may become powerful, dedicated gaming devices (filling the function of a modern console - though rendering, programming, and other media creation will still be done on the PC for some time to come).
I must say that Bob brings up a good point about what we think of as a PC is changing (though his choice of words was very poor, a laptop is as much a PC as a desktop, but he used the term to only refer the the latter). Most of the general populous doesn't need a big box sitting in their room, and can get by on a laptop, a console, and a smart phone (tablets don't count until they start doing it right). HOWEVER, there are enough people out their who need the extra power that a desktop offers (for rendering, programming, gaming, or whatever), or who just prefer the fixed setup that it's not going anywhere in the immediate future.
I think Bob's mistake in this episode was not understanding who PC gaming appeals to. With the exception of stuff like Peggle and Farmville, the casual gaming crowd just doesn't usually play games on their PCs. They play almost exclusively on their consoles, hand-helds, and smart phones. They can just use a laptop for their PC-needs. We modern PC gamers, however, still need those big boxes on our desks. The way we play games is fundamentally different from the way other people play games - at least for the foreseeable future, it's simply not possible to duplicate the experience of playing CS:S or TF2 on, say, an iPhone. PC gaming in its current form will live on until portable devices actually catch up to what desktops are capable of, which won't happen until there's a change in the basic technology. For now, the box simply offers room for more circuits and more processing power.