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. 

You should have before and after photos for comparison. If there has a loss of fat in the treatment areas it should be easily seen. Also you should have current weight. 

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.