At your desk, you just need a dock. Everything you currently connect to your laptop can be connected to that dock, and the cables hidden away, then all you need to connect to your laptop is a single USB cable.
Away from your desk, why is the dongle for your keyboard and mouse a concern? Most dongles are tiny, and can be left plugged in permanently.
(Well, OK... it is making stuff worse, because you'll need to throw away all your old stuff and buy new stuff... oh, wait, you were thinking of keeping your old laptop? Well then, you'll need two sets of stuff! But the original point was solely about the cables and dongles.)
Not like it matters too much, but I see some point in it — I come to my desk, plug in only one cable from the dock and have it all set. Also I can easily see how demoing it from the stage falls under what Tim Cook calls "innovation" nowadays. Which seems to become more and more important to him.