Wait, what do you mean reintroduction?
Anyone who's been a gamer since at least the SNES days remembers that wireless controllers were a 'wow' factor even back them. I think I even had one for the NES. As handy as the controllers were, they were a flop due to technological limitations, mostly in the use of standard 'remote control' technology in the controllers. In order to use these controllers, players usually had to set up a special box in just the right position and sit in the right position so the signal hit the box. This has all changed now that the technology is affordable and available.
Wireless controllers are very useful and quickly becoming the controller of choice. You can sit anywhere, no matter how far from the TV you are and not have to worry about people tripping over wires or knocking your system over (by pulling on the wires). But what about all of those wired controllers we've been amassing? Do we have to buy all new controllers? That's where the WOW comes in.