So there are 3 interactive videos featuring the creators of Robot Chicken and Seth Green talks the Whedonverse in these 3 clips:
"Taken from Oz"
"Hamming it up with Joss"
and in that 3rd part he blatantly says that he's offered to Joss to be on Dollhouse. He could very well save the day over at Doomedhouse. Check out the extras below - you can find them under Part 1 Extras on the right of the screen.