The Tablet will succeed by aligning itself with niches in people's Lifestyles.
FAMILY ROOM/LIVING ROOM/COFFEE TABLE
This Lifestyle niche is currently under-exploited. This is where families live and interact... television, games, reading, communication, photos. Currently, most families do not go crowding around the computer in the Home Office to share things. This keeps them on the couch at Christmas as the lightweight tablet gets passed around. Most importantly will be its ease of use - a computer that even your Grandparents can use, just like an iPhone. Much more convenient than a laptop which can be awkward with its clamshell design and tendency to get rather hot for actual lap use. This niche also carries over to the family auto for taking trips.
- Versatile Remote Control interface that any manufacturer will be able to create an App for to connect with their device.
- Webcam built-in to enable camming from the couch, with families interacting with extended family long distance, the tablet being passed around on the couch from Mom to Grandma to Child. For the webcamming single guy, this gets him out of the office chair.
- Game playing, beyond just a larger screen for current games. A replacement for board games by placing the tablet on the coffee table or couch cushion, allowing multiple players all viewing the same screen. Monopoly, chess, checkers, dominoes, etc.
- Access to other computers in the household for displaying photos, streaming movies, reading files, etc.
- More!
BUSINESS TRAVELER/FIELD EMPLOYEE/CORPORATE CLOUD INTERACTION
- A tablet to replace the weight, expense, and overpowered functionality of the laptop for a good majority of business travelers who only need access to email, contacts, internet, and corporate networks.
- Corporate Cloud interaction so the tablet at times acts like a dumb terminal, feeding information back to Big Brother. Used at times as a digital clipboard for gathering data (field techs, nurses, doctors, sales people, surveyors, etc).
- Digital presentations connected to projectors or viewed directly on the device, whether the presentation is stored locally or accessed through the Cloud.
- More!
CREATIVITY/STUDENTS
So many Creativity Apps already exist for the iPhone and have been very successful. This expands those possibilities with its larger screen and ability to connect to other computers at Home, School, or in a Studio.
- Photographers will appreciate the lightweight and could gain the ability to control a camera remotely while simultaneously viewing the large sceen. Great for field uses, cameras in hard to reach places, adverse weather, etc.
- Wacom tablet-like functionality for digital painting and photo manipulation. Fingerpainting for children without the mess, but with the ability to print through a School or Home network.
- Low-cost arrays for display and installation purposes
- More!
Think about Lifestyles first, rather than technical innovations per se. The key here will be the application of the tablet in people's lives. This is where Apple has succeeded with the iPod and the iPhone... by introducing technology that impacts Lifestyle, not just by coming up with another cool gadget.
EDIT: I personally hope the physical design of the tablet will resemble an artist's palette, with a thumb hole off to one side. This will make holding it with one hand easy... for typing and other touch screen uses. This will also allow it to be held easily in landscape or portrait orientation.