I hear ya. My TV is just a couple months old, but would be "obsolete" tomorrow if a 48fps spec for BR/HDMI came out then. If HDMI had been more flexible like the DVI spec it is based on this wouldn't happen. Is the framerate/rez within the bandwidth limits of the sender/receiver? Ok, then GO, dammit.
...But noooo. Can't be like that. It's almost so you suspect they do stuff like this on purpose to give people incentive to run out and buy new junk. Kinda like when whatever flavor of Dolby/DTS bluray audio some years back suddenly couldn't be transported over HDMI without HDMI equipment with the required logo stamped on the front bezel. Like those bits were so fricken special they simply couldn't survive in existing equipment.