As Mike said, 72mhz will be an option at clubs fields for some time. In fact, with more flyers using 2.4gig equipment, there will be less congestion on the 72mhz channels. Over the next few years, I think, the choices of new 72mhz radios will continue to taper off and eventually, the only new units available will be 2.4gig (unless something else comes along to replace it).Even then, Iexpect that we will still have the option to use existing 72mhz radios if we have them.
JMHO