There aint no way I'm ever going to use the ipad. However I doubt apple will fail to find a market for it.
It simply isn't useful for me.
I don't read books on computers, if ebooks with their advanced digital ink screens haven't convinced me a normal computer screen that kills me eyes certainly wont.
I can't edit video effectively on it. Thus its worthless for my industry. I mean I nead terabytes of data ever year just to keep working. Thus a desktop is what I use.
I game on my windows pc and my 360 and DS.
So unfortunately I think the ipad is simply a device that wont fit into a lot of peoples lives. However I wont be the one to doubt apple, they're one of the most successful companies in the tech world for a reason. They know how to create demand for their products (and they are very sexy).
But their is a reason tablets have less then 3% of the Australian portable computing market. And thats because they're simply a niche product with niche appeal. Apple will transcend that niche market somewhat but by how much I don't think anyone is certain.