The biggest problem with access points isn't how many users a single one can support, it is collisions, especially collisions that only the router can see, but each client can not because they are too far away from each other (called a
hidden node). What could work is a packet scheduler, where each Wi-Fi node is guaranteed a time slot where no one else will broadcast. With six robot Wi-Fi Nodes (Nodes or access points in 2009?, the field control system would need to connect to six AP's at once), plus six operator interfaces linked via Ethernet to one Wi-Fi access point, could mean quite a slow down with or without collisions.
In short, there is no way we are going to be streaming video, over Wi-Fi at least. Now, however, we get to use 900MHz video broadcast systems, which are much simpler (this assumes that independent 900MHz systems will now be allowed), being the analog TV band (I think...).
Personally I enjoyed the 900MHz network. Wi-Fi is just too complex.