ORIGINAL: dbspl
I'm not sure I follow this. There are 83 available channels in the 2.4Ghz band. Are you saying the data rate is reduced on just one of those channels, or the entire 2.4Ghz band? It would seem to make more sense if it were just 1 channel, but that also would leave you another 82 channels that would be uneffected.
The spread spektrum concept is that every .4 seconds the signal is transmitted over a different channel of at least 75 out of 83 channels available in a 30 second period.
Every 30 seconds the system has transmitted on at least 12 channels. As soon as you get 80 people flying (40 in the case of Spektrum) you are going to be sharing channels. As soon as you get 2 or more people flying you will have competition for those channels and that competition increases exponentially as the number of users increases. It also increase the amount of lag due to open channel searching and loss of data.
Channel sharing (multiple users on a single carrier frequency with digital identification) is almost identical to the technology used in ethernet (WIFI and wired). Sharing the channel reduces the data through put for each user on the channel. This has been the bane of computer networking for years and it is always a problem, not a solution.