Ah , ....I should've thought of that!

Ummm , I guess they'd need a different approach .

Weight is not the most accurate way to measure your level of general health , BMI is a guide which is normally used in conjunction with other info . It doesn't work for people overly obese/muscular or for the elderly. Muscle is considerably heavier then fat - it's not uncommon for 'body-builder types' to be 15-18st and still be perfectly healthy (yet their BMI would place them as obese.)
My Dad - according to Wii fit is in his ideal BMI range - but he's anything but (huge beer belly !)
The current recommended means to determine your level of general health is your hip to waist ratio - that is something camera tech could determine.

For centre of balance - natal supposedly builds up a skeletal profile of the user - both EyeToy and Natal could at the very least track the outline of the user - in which case the software could track position changes of the shoulders, back and hips throughout the duration of the exercise to determine the results.

You're right about the camera having problems with the minor balance issues , but , considering that these products are aimed at people who feel unhealthy + want to improve without going to a gym - what would be more important - losing weight or improving your balance? Exercise wise - I do think motion camera's have the advantage. I'd have to think about the balance issue..... there might be a way.

I like Wii fit - but I do think there's room for improvements....

Me too , apparently the story arc from Fable II spreads over 3 games ......
Don't know about you , but I really felt the blind lady who helps you had motives of her own....

Maybe Fable III will have Natal controlled gestures .... and chicken kicking!!! Ha ha!

I like Halo alot , but I gotta admit the Metroid Prime games are really, REALLY good and manage to stay true to their platforming roots , essential for anyone who's got a Wii.

I haven't got Corruption yet , as I'm still halfway through Echoes, -looking forward to it though!

I actually doubt this .

I remember reading in Edge a while back that Nintendo took such steps (motion tech) in order to avoid direct competition from Sony & MS.
I also feel the Wii's capabilities limit what can potentially be done - I know graphics aren't everything , I'm thinking more along the lines of open/intricate environments + intelligent NPC's , (and in some cases graphics really can make a difference e.g Dead Rising on Wii compared to x360.)

The main reason I've kept hold of my Wii is beacuse of it's social gaming aspect via the motion controls. My point is that MS/Sony can now do everything the Wii can offer, but the Wii can't do everything it's rivals can.

For example , Wii fit (my favorite wii game) is based primarily on balance and posture. The balance board is pricey but decent , but it does seem a little odd that some of the best exercises do not require the board at all (like jogging.) And in all it feels like a rough estimate - it's up to you to try and do things properly.
A health game with camera based motion tech like Natal/Eye toy could potentialy detect your actual posture/form throughout and count actual reps , and be significantly cheaper due to no need for a balance board, and even allow multiple people to use the game and have results recorded at the same time.
In other words... one of Nintendo's biggest selling games could be done cheaper, more accurately/effectively on other consoles ....... and he's not worried?!?!?

I'm trying to be cheerfully optimistic about the vitality ring, but lets be honest , it just measures your pulse - it may have a few novel uses -but it's hardly going to set the gaming world on fire.

I did like the Nintendo conference this year, but I think Sony's & MS's were better.

Have you seen the game's trailer? - It looks very impressive , like a cross between GOW & Shadow of the colossus .
The monsters shown are huge!
Can't wait!