I don't think anyone wants to take credit away from Gruber. My understanding is that they want to move the language forward. More people than just Gruber use it now. I haven't been following him much recently, but for a long time his attitude was, basically, "You can't change anything without my approval but I'm not going to invest any time in this." The way he has handled Markdown's success over the last few years has not engendered my respect.