The simple fact is that you’ll never get everything on one device. It wont happen until we evolve better eyes and smaller fingers.

You cant watch a video for any length of time on anything under 3.5″ across.
You cant type at an efficient speed on anything less than a mini-qwerty keyboard.

So why bother trying to cram it all in to one device? i guess the marketing people can answer that question and its probably something to do with customer perception.
If you do buy the all-in-one device though, I can guarantee you wont get the best out of it.

I’ll go into a few details in the next post about what I consider the optimal convergence to be and what ‘all-in-one’ means. Some convergence is definately possible but becuase of device overlaps, physical constraints and a tendency for many technologies to evolve towards the smartphone, a new device segment is being created.