i don't think it would work so well now because Vick is a Dual threat QB, but if you put Schaub in at QB and make Vick the RB then you lose one of your teams more threatening players.
the whole point of him being such a threat is the defense has to watch the recievers backs and tight ends. if hes at rb he wont be the running threat he is now because it will be cbs coming after him not the big dt