I mean no disrespect, but try not to kid yourself with the idea that desktop computing is is on the verge of being phased out.
Yes, it is true that Windows 8, which is being released tomorrow by the way, is primarily an operating system created for tablets. MS likes to think that they are bridging a gap, much like apple is doing only much slower (and TBH the RIGHT way) when in reality they are alienating the PC with a touch-driven start screen. It may be a success for the tablet market, but it will flop for the PC market much like Vista did, and 3 years from now Windows 9 will be out and will take the place of windows 7 as the best desktop OS because they will realize that tablets and mobile phones are only COMPLEMENTS for desktops and laptops, NOT full blown replacements.
There are still plenty of hardware manufacturers (think intel, AMD and nVidia) out there that are pushing out top of the line desktop components. They, to my knowledge, have no intentions of ceasing their desktop manufacturing line in the foreseeable future. Why would they? They make too much money by staying above the curve.
Because of these ultra-mobile devices desktop sales are taking a HIT, NOT being completely crippled. Any news you may read about Windows 8 being "Microsoft's chance at redemption" or "Microsoft's last hope" are BS. Microsoft is like the 'AT&T', 'General Motors' or 'General Electric" of computers. Windows is still the number 1 choice for corporate server hardware, corporate user desktops, PC enthusiasts, and gamers, while still holding a decent chunk of market share in the 'home users' category. Until something completely radical changes that the desktop PC isnt going anywhere.
Oh, and as a side note to Slade: Its great that Linux works out for you, however can you imagine a non-tech-savvy 45y/o trying to operate a linux machine? I just dont see it... Again, not trying to put you down or anything.