With Murray it's an age thing now. He thinks (rightly so) that they're all a bit too old for another GB. I mean, take a look at these guys nowadays - it would be sort of pathetic to watch them huff and puff through another sequel. He's hip to doing voiceover for a CGI version of GB, though, where the characters could remain ageless. I forget where I read those comments, but it was around the same time that "game" video emerged.