We'll see. I'm skeptical it will get that high, as everyone needs a PC and/or laptop, not everyone needs a tablet.
So Apple gets Mac sales from people needing pcs/laptops but wanting to get away from Windows, while the Tablet will just appeal to people who need something between a phone and laptop AND don't care about windows OS etc. so it's a smaller market as a whole I'd think.
But I hope it sells well. Even though it doesn't quite fit my needs, the iPad selling well would prove there is a market for a tablet devices that aren't full PCs and give me more options as competitors rush into the market.