The synergies between RFID and Wi-Fi are too obvious be me missed.
The most likely applications occur when there is a need to find a RFID device's location and not just read the information on it as it passes in range of a reader.
The tag might be on a person or an object. People already wear alarm pendants to signal emergencies and it would obviously be an advantage to know where the person is when the alarm goes off.
In this sort of scenario, the growing Wi-Fi network can be used "parasitically" by adding Wi-Fi capability to the RFID chip. Another option is zonal RFID arrays embedded in ceilings.
There is a name for this type of systemReal Time Location Systems (RTLS). To qualify as an RTLS the system must be able to provide real- time identity and location most of the time, or when interrogated.
Look for RTLS to grow to a very significant portion of the active RFID market in the future.