I particularly like the statement above. I think the PC example is a good one, and then smartphones/tablets did the same thing to PCs.
So either we figure out how to make touchscreen+voice to work effectively for content creation, or we'll have to use something other than a tablet experience for that.
The hardware is there already, but the stylus-optimized software is thin in the ground.
For graphics and CAD work, I need the precision of a mouse cursor. My laptop's trackpad works great, and my mouse works even better. My fingertip on a screen, by contrast, will always feel clumsy in comparison. Fingers are just too fat. The only way they become not too fat is with a gigantic screen. But then that's not really a tablet. And gigantic screens can be ergonomically bad, because they force you to bend your neck looking at them.
Likewise, for serious typing, I need the tactile response of a keyboard. Touch-typing on a touchscreen is frustrating.
Of course, there's no reason you can't attach a mouse and keyboard to a tablet. But then you basically have a laptop that doesn't fold closed. It's hard to consider that a uniquely tablet-esque experience.