The problem is that there is a hell of a lot of general purpose software out there already that's never going to be worth the effort to port to a single device.
The iPhone has some nice apps, but runs nothing important to me in my professional life. And if the new tablet isn't going to be a useful work tool, why would I want it?
I honestly don't see the value proposition either. Oh wait. That's because Steve hasn't taken the stage yet to show us that Apple has created something of value that we didn't know we wanted until we were shown. Some call this fanboyism. It's really just creativity at its best. Creating new things to make life better. That's what apple does, and they are handsomely rewarded for it.
The iPhone has some nice apps, but runs nothing important to me in my professional life. And if the new tablet isn't going to be a useful work tool, why would I want it?