RE: I need your honest opinion.
I'll start by saying 72mhz is not dead. Many and I'm one of them still fly on this frequency. The reason I stayed on this frequency is simple a matter of convience and economics. I use nothing but JR top of the line receivers and transmitters. RC manufactures switched over to the new frequency to decrease cost and increase sales. They accomplished both but failed to do the R&D. Now you the consumer suffer the consequencses. The same thing occured on 72mhz until they released PCM receivers. Standard FM receivers just won't work in a high RF noise environment.
If you operate with low end 72mhz equipment I would make the switch to 2.4 but if you have a 72mhz transmitter capable of SPCM transmission don't switch. Purchase compatible receivers to match the transmission signal and you won't experience the dreaded "glitch" problem. I flew glow powered helicopters for many years and never had a glitch that I was aware of.