Is it not diversity as you've suggested in you references to lots of technology? Are we seeing more diversified use, ie horses for courses?
I was a PC fanatic but I find that an XBOX does fine for my gaming, the PC for my photo editing and uploading to sharing/stock sites and practically everything else is on my tablet, including checking on my social networks and general browsing. Slouch on the sofa, tablet up and running in seconds flat and you're chatting to Auntie Doris in Oz on Facebook, while watching an episode of something on TV or possibly in another window on the tablet itself.
We have so much more choice of device now, ones designed to perform certain tasks perfectly, the PC is not the one-size-fits-all it used to be and is therefore fighting to maintain our attention when it comes to upgrade time. We often can't afford to upgrade all items at once, the manufacturers are cutting great deals on cheap tablets so being savvy consumers we're upgrading those while the prices are reasonably good.