IMO, the people here are missing the point.
The tablet was never meant to succeed the laptop, I feel it was intended to serve as an alternative for people wanting the traditional processing power of a computer, but hating the bulky and unwieldy nature of a laptop.
I will give an example. I am a teacher in an elementary school using interactive whiteboards (IWB). Prior to the ipad, we had to plug our tablet laptops to the board using a myriad of cables. This meant I was tethered to my desk, and often found myself stepping or tripping over some wire or another.
I am currently trying out the apple tv + ipad combo in my class, and although it is just the 1st day, I am genuinely impressed (previously, I used my ipad + vga adapter). I can circulate freely around my class while still updating the board from anywhere. The keyboardless form factor of the ipad lets me hold in one hand while annotating with the other. The camera lets it function as a makeshift visualiser. The long battery life means I can last a full day without worrying about running out of juice. Writing on goodreader or educreations app feels more fluid than activestudio, while the iworks suite runs way more smoothly than office.
In the same vein, while each classroom in my school is equipped with laptops for every pupil, I sometimes wish they were ipads instead. The biggest flaw posters are bemoaning here - the lack of a proper file system, would actually be a boon! 7-9 year olds no longer have to fiddle with confusing directories to locate the files they want. Instead, all the documents they have ever created are sorted by app (and folder if they want) and laid out in a clear graphical arrangement. If I want to continue working on a ppt presentation from last time, I don't need to first open PPT, then click on open and hunt for the save-file in question. I just fire up keynote and tap on the file in question. Less time is spent troubleshooting and this means more time on the task at hand.
Likewise, the ipad offers instant-on, cheap learning apps (better than the school having to spend money on custom software that is often obsolete by the time it is released), takes up much less space, and kids seem more adept manipulating a touchscreen over a trackpad and its interface is easier to navigate.
The point here is that not everyone needs to use their laptop in the "poweruser" manner in which the people here are claiming. You have to realise that this forum tends to attract people who I find tend to be much more tech-savvy than the typical PC user.
I think I can confidently say that the ipad will well replace my laptop entirely for my classroom teaching. Just about everything (except accessing the school network drive) I was using my school-issued laptop for, the ipad is doing just as well, if not better. I think this is what Steve meant - tablets replacing computers in tasks that laptops were just ill-suited for in the first place, for which there are many, because not everyone is a web-designer, app-creator, photographer or needs to run 3 virtualisations on their desktop.