DECK'ARD said:
Possible, but again not very Nintendo at all. It's a messy solution, and if the selling-point of your console is to play games away from the TV it becomes less of a selling-point when your 60fps Mario game doesn't play as well doing it.
Why a messy solution? Some games from the Wii Sports/Play collections were largely unplayable with even minor IR interferences. Did not stop nintendo from releasing the Wiimote or the software lineup. Other titles which still employed pointer controls were quite forgiving, and could be played even when facing the poly star of Betelgeuse (hyperbole).
The way I see it, there will be official recommendations for optimal-performance gameplay, just like the case with wiimote IR, or Motion+. So one would need to adhere to the recommendations if the person cared about optimal experience. If you want to play Mario from the bathroom, you should be prepared to suffer the lag. But nobody would be stopping you. Just as nobody was stopped me from playing various Wii games with IR interference when I couldn't be bothered to eliminate the source of interference.
The data being sent with controllers is minuscule compared to streaming video. The controller has to receive a whole frame before it can display anything, the latency will be a lot greater especially on top of WiFi's normal latency.
You seem to be fixated on the worst-case scenarios. Look at it from the bright side - WirelessHD in its current form is good for 1080p@60 - should be able to feed 4 controllers ok.
And the more controllers you have, the more of a headache it becomes sending everything and keeping them all in sync. 4-player 60fps games would probably be a nightmare. Nintendo may have found a magical solution to all this when no one else has, but I'm not expecting it. And if they haven't solved all the issues, I doubt I'd want it anyway.
I know I will want it. I've been a user of similar mobility technologies for years now. I.e. technologies where I need to meet some optimal-condition requirements to get optimal results, but tech would still work under suboptimal conditions, at some loss of quality.