Bluetooth has just pulled the rabbit out of the hat: Instead of thudding its way to an inevitable spiral of obsolescence that would mean less and less interest, support, and embedded devices, the Bluetooth SIG will work with ultrawideband (UWB) vendors to ensure backwards compatibility with their spec.
This is a brilliant move, of course, because it helps both Bluetooth and UWB vendors in three ways. First, including Bluetooth 2.0+EDR in near-term product plans suddenly makes sense because the devices will continue to work with laptops and other equipment that are issued in the not-too-distant future. Second, it re-emphasizes the notion of including Bluetooth alongside Wi-Fi as a built-in element. Third, it gives the UWB vendors an upgrade path, making their products less disruptive technology than evolutionary technology.
The Bluetooth SIG has support from both major UWB linchpins, Intel and Motorola, but specific details and relationships with the UWB alliances hasn't been sorted out yet.