I don't think Microsoft is under threat other than competition heating up. IMO, competition is good news for the consumer and this will also continue to drive for greater development.
Desktop components will get lighter and smaller but at the same time, cheaper and more powerful and easier to setup.
Aleady there will be greatly enhance GUI workflows for starters;
Leap Motion easily hooks up via USB and is cheap.
Several years from now there will be improvements in monitor technology available. Greater quality and larger display
at a lower price.... Because new monitors will use new amazing technologies that will be more efficient to manufacture, lighter yet stonger (reducing costs) Compare back to decades ago and Google around now for the latest, there are some very interesting devepments in the works.
Apple vs PC, whatever floats ones boat, much the same in regards to DAW's. There are several really good hosts that can handle massive size projects and get the job done without a sweat.
Overall great developments on both sides of the fence.
Slight Con; technology is advancing at warp speed which means, 'upgrades' will be nessasary IF one wishes to keep up with the bleeding edge of technology. And watch zombie movies on a 98" Air-Gesture display running Windows 13.sp2 or Mac Goliath 9.3 in full 3D surround holographic mode.... ARGHHHHH!!