While I agree with the sentiment, presentations via google hangouts/screen sharing has been absolutely wonderful. It's cross platform and in our experience usually "just works" and doesn't require any wires!
Wait until you want to display a breakdown of a merger bid to a board of directors who each had to lock their cellphones in a box before entering the room. Sometimes Google hangouts isn't an option. Sometimes that physical wire is needed.
We're very close to a world where we only need to plug in the USB type-C connector and we'll get power, internet, and display all in one cable. To me that's the end-game.
Up until this moment I actually believed Android/ChromeOS was ahead of the curve with USB type-C. I think we'll reach that moment as soon as we have Type-C laptops from Apple and Google.