I agree with Sport_Pilot on this one, As far as 2.4 being replaced i'm not that surprised I think a few years ago there was talk of going up to the
5ghz range. IMO there aren,t that many problems with 2.4 that can directly be associated to the 2.4 frequency itself of course that may change.

It may be possible that the AMA may be aware of some changes coming down that may have a negetive impact on 2.4 but at this point who
really knows. One thing I dont like is most radio manufactors have discontinued the module. system