Here are some trend graphs from last year's data that pose interesting points and verify a few old predictions that I had made a while back.
Tablets may be still growing, but they are already replacing phones as the preferred way to do a web search.
The US is down in tablet usage compared to European countries, mainly because each US user already has a PC and a laptop, a phone and sometimes also a tablet whereas most of the newer countries only have the phone and the tablet. These latecomers see no need for the PC except for more massive "at work" tasks.
Relative affluence affects the computing choices commonly made in various countries. India is just getting to the point families have fridges and TVs and stuff, a PC isn't a readily sharable thing really as only 1-2 can use it at a time.
Asia mirrors this "no PC" trend, not needing the individual copies of the PC because they tend to use the family TV for the bigger stuff.
Remember also that very few Asians keep a separate room with tables for their computer stuff as is commonly done in the US, their phone and tablet tend stay by their beds when not in use.
Before he died, Steve Jobs concepted the IPad which started the tablet revolution. At the time he said, "Think of the PC as a delivery truck, doing all the heavy hauling. Think of the Tablet as the family sedan, taking you where you want to go in comfort. Think of the Phone as a motorcycle, fast and agile, but just can't carry very much."
I think that in America Jobs was right. I also think in the poorer countries a tablet really does fit the bill better than a PC on both size and cost. Tablets are going to get better and cheaper over the next 10 years and the PC is going to become a practically extinct dinosaur. Even the shooter games will all shift over to tablet space as convergence finally arrives and phone/tablets running the same software take over everything that isn't "commercial heavy hauling".