A thought-provoking article that's well worth reading in its entirety. Here's a key portion of the article:
It's hard to put together a convincing forecast of anything except chaos for Wi-Fi. Not this year, not even next year; but after that, the 2.4 GHz band of 802.11b and 11g and 11n will become too congested to use. Can Wi-Fi survive the public disillusionment that will follow? I wouldn't say so.
Meanwhile, the success of Bluetooth is likely to expand. The current spread spectrum technology at 2.4 GHz can duck ad weave around Wi-Fi because it doesn't need to be as ambitious in terms of bit rate, and because of its inherently more efficient use of frequencies. And by the time 2008 starts up, I would bet quite a lump on seeing UWB established as a de facto Bluetooth technology, for handling the high bit-rate stuff.
If the Bluetooth SIG has the foresight to build Mesh technology into its chosen version of UWB, then it will win. ...
What will provoke the switch to UWB and Bluetooth?
I'd say: "Laws."
Some time in the next two years, I expect to see metro area authorities start to call for the banning of Wi-Fi except for the networks they run themselves. They'll be happy to have residents use the metro Wi-Fi, but they won't be happy to have their own critical communications infrastructure sabotaged by seeing fifteen residents each set up a powerful MIMO device on channel 11.
Precedent says that they can do it. Several airports have banned external Wi-Fi from their territory, despite the theory that it's licence-exempt and therefore open to anybody. If a democratically elected body bans private radio transmissions in the area, the only problem is policing it. And the operator of a city-wide wireless network will have no trouble at all in triangulating onto rogue hotspots.
That will make it necessary for people who want their own, private access to their own, private home server, to use another technology. Mesh-linked UWB networks will suit just fine: high speed - faster than you need for high definition TV, anyway! - and low powered wireless which will carry voice, data, and video without interfering with anything else.