I think the tablet has plenty of uses, but it's the flaws that hold it back. We actually have a tablet at home and it was very useful on the couch and in various other roles. However there are a couple of features that are a must for such a device that I can't see being able to be provided easily:

1. I must be able to drop it from 6ft onto a hard surface and do zero damage

2. I must be able to pour a whole cup of coffee on it with zero ill effect

3. It must be able to be stolen with a cost to me of less than $50

These are the killer problems for me that make it an unsuitable thing for 'casual' use. If I have to treat it with kid gloves, watch it like a hawk whenever I put it down in public, assume a posture of paranoia about food and drink while I'm around it .... then it's just a failure at its main purpose.