WWANs, WLANs, and WPANs have distinctly different requirements, and the technologies best-suited for each of them have different characteristics. IEEE 802.11 and Bluetooth wireless technologies are optimized for different purposes in different domainsWLAN and WPAN, respectively. The same design points that make them well-suited for their primary intended purposes make them less well-suited for other applications. Bluetooth wireless technology is not a robust networking technology; IEEE 802.11 is not the preferred technology for WPAN applications (indeed, the IEEE is defining its own WPAN standard based on the Bluetooth specification). The IEEE 802 working groups and the Bluetooth SIG have a cooperative relationship, and are working together on the issues of coexistence in the spectrum that they share.
There is no competition to determine a "winner" and a "loser" here. Both technologies can succeed on their own merits without detriment to the other. It's a phony conflict.