Eh. I think the core of Scream has actually been the combo of Sid, Dewey, and Gale, as long as one of them is around it can continue to be good.
I just don't like the mentality that there's no way to successfully continue a horror franchise beyond it's original heroine no matter how awesome they are (Laurie/Sidney). Especially with Laurie, the problem was that the actress no longer wanted to be a part of it and many of the faces behind the plotline that killed her off twice were not the same as the ones that created her.
Williamson hasn't let me down yet in any of his projects. It's a proven fact that when he's behind something it's good quality stuff. (Scream 1, 2, Dawson's, Vampire Diaries.), but when you take him away from that they begin to suffer. The REAL heart of the Scream series is HIM. Look at how Scream 3 was mediocre or just average when he wasn't involved. Even I Know What You Did Last Summer to I Still Know shows a great drop in quality because he was no longer involved.
People simply don't give him enough credit. The man is what made the Scream series, Sidney Prescott, Gale Weathers, and Dewey Riley. If he's continued to be involved, Sidney or no, I will support these films, because I know he's got something crafty up his sleeve.