I don't think that 27, 50, and 75 MHz will be going away soon. We are already sharing some of the currently authorized frequencies with Industrial, Scientific, and Medical users - and they are listed as the primary users, while we model drivers are secondary users. That's why all of the radio manuals have the fine print about the gear complying with FCC Subpart 15. There is a "which radio" discussion at rcgroups
. I found Gill RC's second post in that discussion to be interesting - as it may cause problems for all those that have jumped on 2.4.
It was about 20 years ago that we got the additional frequencies that we now enjoy. I remeber in the late 70's and early 80' there being only 11 channels in 72 - 75 MHz; 5 (all on 72 MHz) were shared by surface and aircraft models; the remaining channels (only 1 on 75 MHz) were aircraft only. The Academy of Model Aeronautics took the lead and lobbied the FCC for increasing and splitting the frequencies. The result was that we ended up with 50 aircraft only frequencies in 72 MHz and 30 surface model frequencies in 75 MHz. I got my Ham radio license about 7 years ago, and operate 4 subs on 50 Mhz; my two other subs (and 25 targets) are on 75 MHz.
So what can we do?
1. Buy some new radios or receivers on 75 Mhz (and 50 MHz for Ham operators). This should let the manufacturers know we are still interested in those frequencies.
2. Write to the radio makers and ask when they plan they plan to make more radios available.
3. Write to the AMA and the FCC and let them know that we are still using those frequencies.