Ar-g-g-g-g-g-h!
But seriously, I think that's unlikely.
If W withdraws Miers, it will be in large part because he realized that he cannot afford to alienate his conservative base. Nominating Gonzales on top of Miers would be such a provocation to the right that it would make the rift permanent and in many ways doom the Bush presidency. I'm optimistic that if Miers is withdrawn the next nominee would be much better qualified and more palatable to conservatives.
Know who DID help vet those judges? A. Gonzales. I honestly think I'd be more comfortable with Gonzales simply because then we'll KNOW what we're getting! I'd prefer someone else over either of them, but at this point I'd take Gonzales over Miers.
*shrug*