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Originally posted by: jasonditz
I was thinking about it, and you could also solve it the same way Sega solved it with the Saturn: multitaps. There's no reason Nintendo couldn't make a wireless multitap that supports a bunch of wired or wireless controllers for massive multiplay. After all, when you think about it, it's already supporting 8 controllers (the four "motes" and the four nunchucks attached to the motes)
Well, no. When an attachment is connected to a remote, as far as the system is concerned that is one device. However, when the controllers communicate with the console entirely wirelessly, the limitation on the number of controllers allowed is much more arbitrary than the number of hardware ports. It depends on the communication protocol being used. There's also a hit on the main processor for every controller it has to deal with, but I can't guess how significant that really is.
Since the Wii is using Bluetooth for this, the four controller limit is probably based on aesthetics and tradition more than anything technical. A Bluetooth network can support seven devices, not counting the host (i.e. the Wii itself), so Nintendo could have claimed support for seven controllers, like Sony did. It is theoretically possible that an add-on device could be made that takes up one of the seven slots, but is itself host to seven more, so the console could support thirteen controllers. If Nintendo had planned for that sort of thing, though, I think they wouldn't have put just four lights on the remotes.
I suppose it's also possible that Nintendo is leaving three slots in the network free for other devices. I doubt the DS would connect that way, but it could be anything from wireless headsets to crazy party game gizmos.