Will the sagginess and rippling from inner thigh Coolsculpting go away?

Coolsculpting typically has minimal improvement the first month so don't worry just yet. You may have some residual bruising or swelling. Coolsculpting does not tighten skin but I would be surprised if you have already enough fat loss to cause skin sagging at 3 weeks. Of course your skin will have some elasticity depending on your age and genetics so I typically don't see a lot of skin sag after a single treatment. 

It is early in the process to be concerned. However, the question to verify with your treating physician is which applicator was used and the technique that performed. The coolfit applicator should have been used. Patient selection for coolsculpting on thighs are keys, and expertise is important.  

Did you have the coolsculpting cool fit applicator used? 3 weeks is too soon to really tell the full effect.  I would wait at least another month and compare your photos before and after and return to your treating physician for examination.