Shrug. I guess if you can't take issue with his points you can always stoop to mocking him for forgetting cables.
The context of the talk I posted was not about about tablets, phones, etc, if I recall correctly. He was talking about X11 in general, though certainly X11's use is limited on tablets and other increasingly common devices.
And the limitations of X11 are very much present on desktops. X11 *is* slow. Compositing helped out to make things smooth. But we still have problems with synchronization of framerates. Expanding a window, for example, isn't nearly as smooth as just about any other OS because the redraws of the window decorations isn't synced to the redraw of the widgets in the app. Furthermore X11 remoting is unusable over anything other than LAN. *Especially* on modern apps like gedit that use client-drawn widgets. And no one is willing to go back to putting the widgets on the server. There's a reason why everyone who needs to remote X11 across a WAN uses kludges like X2Go and NX.
Anyone who claims that an X11 desktop is as smooth and silky as Windows or Mac hasn't used either recently, especially the latter.
All I care about is a way to remote individual applications over ssh. I don't care at all about the protocol or keeping X11. RDP will get us there, better than X11 in the long run.