Something occurred to me about the upcoming Tough Enough on Smackdown!:

They are only talking about men competing. On the one hand, folks will say this is to give gender balance to the Diva Search garbage on RAW - but there's another, logical reason: there's no Women's Division on SD!. Since there's nothing for them to aim for, there'd be no point in them competing.

With that fact, it would make more sense to switch them... SD! could have a new vapid Barbie Doll, RAW an actual worker - but SD! is the roster in need of some fresh talent to bolster a thin roster... so I guess it makes sense.