Impact on Fringe OTA viewers
I can't speak to Cisco but I think there are legitimate concerns about the impact nearby Whitespace transmitters will have on OTA TV reception. Residential TVs are susceptible to degradation in the face of strong nearby signals. The bandpass characteristics of the average TV is not all that great. So a strong signal, even several channels away, will desensitize the tuner preventing the desired station from being viewed.
I also think the Cable industry is concerned about the affect of nearby transmitters but I have not been following the debate very closely.
It does seem that there is an all out effort to shutdown or at-least severely cripple free OTA and migrate viewers to subscription based pay services either Cable or Sat.