all in one device? dunno. camera phone - yes. although my current phone is no SLR, the amount of stuff i have captured on it is unbeleivable - i have a camera with me the whole time, because i have my phone on me the whole time - some of my favourite photo's are shoddy lo quality ones, but at least i captured them! moments that would have other wise bewen lost, i got.
the camera's are getting better - the very first digicams only did 640x480 and were terrible, but then they got better! just because there's a phone attached to it doesn't automatically mean it's going to be crap, just that the ones at the moment are, but they are getting better.
http://www.gsmarena.com/nokia_6630-review-20.php
here are some samples off the 6630, the phone i have just bought and am awaiting arrival - you have to agree that is progress - very good, vibrant, crisp shots, with very good colour, not fuzzy or grainy at all in the right lighting. (many phones now have flashes as well) - if you added the ability to text someone off your digital ixus, would it become crap? no.
mp3? it would need a hard drive to become viable, which is actually where the industry is going - with HDDs getting smaller, rapidly, many companies are thinking of HDD camera's and even HDD phones, using something like a next generation Hitachi-like 1.8" drive. capacity and size can only get better. look at the progress in the last ten years! (what HDD did you have 10 years ago? i had a 500MB main hard disk - it was plenty. my brother now has 500GB).
again progress and logical progression would point to you filling it with music as well.
video is the moot point though. it would need a very large screen to become effective - i watched AvP (sh*t!) on my friends Ngage and it was crap - the screen was just too small, and there was just too much going on. it would need a big wide screen monitor, eg nokia 7710. this makes the device a lot bigger, especially with the HDD.
I can quite easily see me buying a HDD camera phone with Mp3 ability, if done well, and shrunk enough to not be cumbersome (ipod
)
listen, apple - your logical way of manufacture would point to you making a very good device - ipod ease of use!