The demand is not enough to make it worth it, essentially. Wi-Fi kind of sucks through walls anyways, so until that's improved, it may not be worth it anyways.
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I think a lot of the gadgets right now are too difficult and annoying because Wi-Fi is not as accessible. Expect this to really hurt the Wi-Fi market.
Should be interesting to see where this leads. There is a ton of money potential but little stability.