Yes, but I'd like X.org to become an optional part of the Linux stack before Linux becomes mainstream on desktops and tablets, otherwise people with serious app will hook into X.org to get extra flexibility and X.Org will stay on top for a lot longer. And I hate X with a passion while I have to deal with some of its API (xlib) it's so awkward bleehhhw
Well others would like to move between device types and work witht he same applications and files.
You can work with the same files using cloud storage. Such as Google Drive, Microsoft SkyDrive, Ubuntu One, Dropbox, or ownCloud, Git, rsync, etc.
But a 24" screen is different from a 7" tablet.
The applications would be different on such screen sizes.
On a tablet, you need applications with big buttons so you can use the touch interface to press them.
On a desktop, you don't want a touch-adapted interface with overly big buttons, because you use your mouse and keyboard.