It's nice people can still get paid to write FUD link bait articles based on server stats and not real world usage. If you don't understand how, when and whythese devices are being used the stats are meaningless.
Of course tablets and phones are outpacing PC sales and online usage.
The power of desktops and laptops finally got where they needed to be a few years back and many people, like myself, wife and many friends and family, got dual or quad core PCs a few years back years ago are still using them simply because they're so freaking fast we simply see no need to replace them anytime soon.
Phones on the other hand were slow dogs that had to be replaced and tablets are pretty new so of course many people replaced those sluggish phones, bought those new tablets and still have our 4-5 year old desktops and laptops that are plenty fast enough.
Yes, traffic on these devices will obviously go up as we're using our new toys and people tend to surf using phones while waiting in restaurants, doctors offices, while in line to fill up at the gas station, etc. What I also see happen in my house and other places is the tablet has become the armchair browser that people use to look stuff up they see on TV because it's way more convenient than a laptop.
Has nothing to do with Windows getting creamed either, it's just that many people tend to use the internet while waiting and the odds are we have an Android phone and not a Windows desktop handy. If the Windows 8 devices just launched manage to take hold of a segment of the market we might see a shift but at this point Android is the winning system for a variety of reasons starting with Google Maps.
Many of my friends are the same way, Windows at work and home, Android or Apple on the road, it's just the way it is with the new digital divide of hardware and hardly the impending demise of Wintel.
Now that Win 8 has a stronger hand to play it may become a 3-way race but that still remains to be seen.