The problem is the cost of the unit. Just for the transmitter and reciever as well as all the antennas' (yes antennas', more than one) required to bring it to life inside the model would cost around $4,000 - $5,000.
that apparently was a pre production prototype or something similar... cordless phones have been doing spread spectrum for ages, and are MUCH cheaper then that!
http://froogle.google.com/froogle?q=...al&sa=N&tab=wf
the total bandwidth coming out of a phone is also greater then what we transmit, so that shouldn't be a concern. (technically, it wouldn't take much to mod a phone handset/base into a frankenstein rx/tx pair!)
I don't remember who carried it, but I saw a spread spectrum rx/tx (not rc, just raw transmitters) for about $20 somewhere, think it one of the nuts&volts type places...