Personally, I'm in no rush to drop Roy Williams. He still has value and is still better than most SS's in the league. He's had a rough few years and had his confidence shattered...it's time for a real DC to build him back up again and use him for his strengths.
I think Wade would have used him wisely and kept him out of deep coverage last year if he hadn't been injured. We then would have been better with him at SS than with Watkins and then Davis. Watkins wouldn't have been injured trying to play out of position as SS and would have improved our pass defense as he was coming on in certain packages.
If we find someone who truly beats Roy out in camp, fine...release him. But right now, that's a position that is stronger with him than without him.