Sure, but why didn't they use directional antennas to get a demo-dedicated network on the stage? Which would be a good permanent feature for any big conference room come to think of it.
Seriously though, I know very little of these matters, but it does seem like there should be some sort of solution developed for them with the frequency that these issues keep cropping up in major tech demos. It seems embarrassing that companies that are supposed to be innovative and great with technology are being stymied by the lack of WiFi.