Using your definitions, we are just in the computer age, and have been for 70 years (maybe there was the vacuum tube age and the transistor age). That is an engineering definition and doesn't apply.
These padigm shifts aren't about what is inside the device. They are about how the devices are used and how that usage impacts people and society.
The glaring, obvious sign that the world is changing is a grocery store checkout line. Five years ago, a couple people in the store might be looking at BlackBerries. Now, everybody and their kids have a device, and often, those devices are talking to each other, via wifi, 3G or Bluetooth.
That is the people impact in the Post PC world. And that impact will be as large as the impact PCs had on the world (IMO). I just hope it's a positive impact.
I don't see where you got that. I didn't define anything.
> everybody and their kids have a device, and often, those devices are talking to each other
The inter-device communications are just part of the app, another way of describing the cloud.
The ubiquitous embedded device is as unimportant to the PC as the wristwatch. I still don't think a wrist computer (or an iPad) will be so dominant people say, "remember when we used to use keyboards?"
Everyone may have a "device," but they will still use their laptop every day.