It seems pretty likely that wireless networking technologies are going to play a big role in the factories of the future. But for right now, waiting for the market to take off is a bit like waiting for Godot.
Honeywell's wireless roadmap provides a good sign that wireless will have support from major companies. That's no surprise, but Honeywell's road map doesn't give any indications that wireless will enter the factory quickly.
Honeywell is waiting for the ISA to finish standardizing a wireless network, which will undoubtedly take some time. Add on the time to get compatible products developed, then marketed, and you're out a few years. ZigBee is ready and ramping, but even ZigBee Alliance chair Bob Heile expects industrial users to see how ZigBee fares in consumer applications before they install it in factories.