If you actually look at the Gartner report the TechCrunch is based upon you'll see TC sort of dropped the ball here. While it's true that worldwide PC sales are up 1% 4Q14 vs 4Q13, year over year sales figures show PC sales total for the year down 0.2%. What the numbers actually say is the PC market would be far worse off if it hadn't been for a slew of super cheap Windows tablets (counted by Gartner as PC sales) and laptops sold around the holidays. These sales have only come from Microsoft and Intel basically subsidizing the PC market to provide some sort of down market competition to Android and iOS tablets.
If you look at IDC's numbers covering the same time period you've got a YoY drop of 2.1% worldwide. IDC does not count things like the HP Stream 7 or the Surface Pro as a PC in their reporting. However IDC counts Chromebooks as PCs where Gartner does not.
No matter what numbers you look at the PC market is seeing declining sales worldwide. Even if you believe the Gartner growth numbers for 4Q14, they're still a full 4% lower than 4Q12. It looks even worse if you compare the numbers to 2011 or 2010.
It's not a story about traditional PCs vs tablets. The real interesting story is smart phones vs everything else. A smart phone (unlike a PC) is useful for pretty much every demographic in mature and emerging markets. They are where the future growth is going to be. That's not to say the PC is going to disappear but I doubt the market will ever see growth like 2000-2010 and likely will never see another peak like that of 2010.