We are talking about the future, 1+ year from now. Electronic components get cheaper by the day.
If one antenna can get 1 pad working, I don't see why several of them, each individually connected to their pads, couldn't feed signals to all of them?
Curious to hear a technical explanation on why it shouldn't be possible. (I really am curious, not being a smartass.)
And don't give me interference. My band is already using multiple wireless transmitters that operate on 2.4 GHz frequency, same as wifi. If you pair them properly, they operate just fine, no interference.
We're talking about the future, yes, but using technology that we have today - because Nintendo have to develop it, and then produce it. They can't invent something and then have it in production that fast, which is why they use off-the-shelf components. The WiiU isn't going to have anything new or magical in it.
Electronic components do get cheaper, but Nintendo will have a date in the not too distant future where they have to pay for the stuff they're using, and after that they are locked to those components and costs (costs for the first few production runs at least, and they can re-negotiate with suppliers). Plus Nintendo want to be cheap for consumers, and make a profit off sales, so they can't use fancy new (expensive) hardware.
As for the WiFi antenna thing, who says that the designs seen use a single antenna? I'd highly doubt it in fact. Most current WiFi setups use two (aka; 2x2), with Apple being one of the few using three (3x3) to give higher bandwidth. FYI, there is no 4x4, and nor can you split 2x2 and 1x1. As such, Nintendo will be using 2 antenna to feed a single pad, and can't expand it to two unless they go crazy on the compression.
2x2: 300Mb/sec theoretical
3x3: 450Mb/sec theoretical
Now, we all know that theoretical does not in any way equal reality. A 2x2 Wireless N network will struggle to stream 1080p content, whereas a 3x3 can manage it fine - but not two streams at the same time. Basically, stuck with a single WiiU pad unless they compress massively which will kill fidelity.
Bluetooth wouldn't even get anywhere near this, being 2.1Mb/sec (version 2.1+EDR, 3.0 doesn't count as it uses a colocated WiFi... link).
My point about interference is that if you theoretically had multiple WiFi units (ie: two pairs of 3x3), then you'd be using up a bunch of channels, of which there are only 11 (in the US anyway). Add in home WiFi, neighbours etc. and you'll end up a very full spectrum.