Workaround for Mavericks Bluetooth/Wi-Fi interference?
After digging in the aforementioned Apple discussion, I discovered at one point that an Apple technician recommended to one of the participants that they should remove their com.apple.Bluetooth property list.  I did so:

$ sudo rm /Library/Preferences/com.apple.Bluetooth.plist 


and rebooted.  When the reboot was complete, Wi-Fi was working flawlessly with Bluetooth on.  I lost pairings to all my Bluetooth devices except my Magic Trackpad.  I added back my speakers and all remains well 24+ hours later.

UPDATE: Adding my portable speaker seems to have been the straw that broke the camel's back.  Had to repeat these steps and then leave it unpaired to keep Wi-Fi working.