2010 = 13,000,000
2011 = 48,000,000
2012 = 87,000,000
2013 = 198,000,000
2014 = 342,000,000
2015 = 662,000,000
So in the year 2015, Apple will sell its billionth iPad.
Why do I think this will happen? Well the iPad is an amazing product but it is only in its first generation.
With each new generation, the device will become even more useful and more affordable to the masses. Soon, people will own multiple iPads and they will nearly eliminate the need for carrying around a laptop.
The biggest hurdle with the iPad replacing the laptop is the keyboard. It is somewhat awkward to use the keyboard on the iPad screen. Many prefer the tactile feel of a real keyboard. Even though you can plug a standard keyboard into an iPad today (through USB port), it is sort of a clumsy solution.
What I see happening is that clothing manufactures will be integrating keyboards into trousers. You will have the left part of the keyboard in your left leg and the right side of the keyboard built into the right leg. In the middle (the crotch area) will be a touchpad so you can move around the screen and double-click by stroking and tapping the crotch area of your pants. (Please, no dirty thoughts, let's be mature).
For you women, they can also build keyboards into dresses and skirts. This will definitely drive iPad sales to new heights and people will no longer need to carry laptops.
iPads aren’t for work, iPads are for reading. The might sell lots of them (though soon when the Android competition comes out that has all the reading capabilities at the price of a Kindle that’ll probably slow down) but it cannot replace computers. They don’t have the computing power, the screen size, the typing capability or the storage capacity to replace the desktop or laptop.
And those integrated keyboards are a joke. They’re cute and all but nobody is going to be doing 100 WPM on those things. Pads, i or otherwise, are readers, nifty gadgets, but nothing more. They’re no more likely to replace computers than remote controls are to replace TVs. They’re supplemental, not replacement.
I think you are probably on track. I don't have an iPad yet, but next year I plan to buy one.