Unless there is a significant breakthrough in battery technology, you aren't gong to want to have your mobile device auto-connect to your system and act as a hard drive without plugging it in. It's also not going to be an option to do a complete copy of your files as mobile storage grows (it will just take too long)
And if you plug it in, you may as well take advantage of being plugged in for your communications (and possibly other things) as well.
I also don't think that the idea of just moving the files around is really going to work that well in practice. The incompatibilities that creep in between versions of software make it hard to have two machines that will always work with the same file.
not to mention the fact that people like to leave work open when they suspend/undock and move to a new location. you can't do that if you just move data.
> And there will have to be not many, but huge numbers of people — people who matter — who can't share data between computers for the new computing paradigm for the world to assume that data is tied to some physical entity, meaning it makes more sense to plug a keyboard into that entity than have duplicate hardware just to attach to the keyboard.
here I disagree with you. As long as things 'sometimes' don't work, the new paradigm is not going to take over and shut down the existing one., even a smallish minority of people not accepting the new way will keep it from becoming 'THE' way to do things.