I think LE knows that letting Casey out right now would absolutely be the worst thing for them. Too much risk involved that she could commit suicide. Too much risk that she would run. Too much risk that she would end up unable to provide any answers to Caylee's whereabouts for any number of reasons.
I don't think it is going to happen. They will find a way to keep her behind bars. It is what they do and they have a lot more evidence than they have shared with the public. If it weren't for the fact they wanted the high bail set in the first place...we would never have known about the cadaver dogs, the hair, the stain, or the smell. They have plenty more by now.