Who's to say that once this technology becomes completely embraced, the FCC will not take 72 MHz away from us anyway? Hasen't that always been a threat, and one of the main reasons to support the AMA as our frequency lobby? I honestly believe that the use of 2.4 gig will be forced on us whether we like it or not. I am sure we all remember getting 91' approved with the narrow band. These frequencys are a comodity and most people do not really care about our "toy airplanes", especially when there is money to be made.
I think this is actually great and will purchase one of these radios probably this year. I had racing in mind specifically for it as well.
As for needing a bunch of transmitters that would be extremely unnecesarry unless you were worried about your battery running out. The recievers lock onto your transmitter and will not allow you to fly the wrong model as our current radios will.