I wouldn't mind signing it, but you could make the petition a little friendlier. I think your hardware requests are a bit much. I mean this is like asking for the moon: This sounds like you want them to have a hardware division devoted to games, to be like an Alienware or FalconNorthwest. I don't think Mac market share is there to do that. I think more modest proposals, like more GPU updates and better drivers is more in line.
They could use gaming to create demand for their products. It also seems shortsighted to have macs as part of a digital hub that includes entertainment such as music and movies, but not games. So I don't think they've really looked at it. I don't think its a calculated decision, I think its an oversight or lack of resources. Look if they had to move engineers from Leopard development over to the iPhone which delayed Leopard's release-what does it say about resources or ability to multi-task?