-do users want web access on the go with a small tablet? Not that much, I'm afraid: sites get more and more complex, people are used to animations, videos, all things which take computing power and network bandwidth. And site builders want to open thousands of advertisement windows on your desktop.
-do users want E-mail on the go? Yes. But many exchange word documents (heresy, I know, but this is what many people do). And network operators would rather have you use sms at horrid prices per byte. And you need a keyboard. And the device to check E-mail on its own. Think blackberry.
-do users want to phone over the Internet? It's only cheaper and a lot less convenient than a cell phone.
-what else? Music? Cell phones do that. Videos? Get a PSP portable. Games? Cell phone or PSP again. PDA? Cell phones do that. So what else?
So yes, I am not very optimistic. The sharp Zaurus did all what the 770 did 4 years ago and is dead. And it had a keyboard...