If the WWE is serious about trying to revamp the diva's division, and having lost Gail and Melina, the time is right to bring in some established talent if they can. Sara Del Rey would be a massive get if they could. And with the Kings of Wrestling on their way perhaps the Queen could make the jump as well.
I'd also suggest Daffney if they could get her. She's been out of TNA for a while now, although I don't know what her status is right now.
Those two would be able to add some real credibility to the matches.
The real problem though, is one of time. Setting up good storylines means you need good airtime to establish the feuds, and the Diva's aren't drawing enough to warrant that time, which has led to the current situation. It's a gamble, but I would be very interested if they tried (as was suggested earlier in the thread) to launch a Diva's show. Give them the time, the storylines, and the chance to really get people over. I genuinely think if they did it right it would work, but it's a massive chance to take, and I'm not 100% sure that the WWE is prepared to take it. TNA/Impact has been spending a bit of time on the Knockout's and I've found I really quite like some of what they have going.
Still that's the good thing about this new HHH/CMPunk era, everything is in a bit of a state of change, and we're really not sure where any of this is heading.