The Price is Right hasn't changed as much as wheel. They have changed hosts , announcers , pricing games , and the set yet they still play the game the same way as in 1972.
So does
Wheel of Fortune. And like
Wheel, they've added new bells and whistles over the years, whether it be new graphics, sets, music cues, theme songs, or whatever else. Those aren't changes, at least not in the sense that has you crying foul. Those are updates that make the show aesthetically pleasing in 2012.
Again, I'm not the biggest fan of some changes (not a fan of how TPiR is produced now, and I think
Wheel sometimes tacks on a little too much chrome), but at the end of the day the shows are still pretty enjoyable, and stay true to their roots. I don't ask for much in a game show, make it fun to play along with, and make changes that keep the show fresh. Both shows, as well as
Jeopardy do pretty well with that.