Well this whole series started because of a fake death, right? So if the writers are creative enough, it's very easy for them to say that that was not Sara's head.
For starters, it didn't look like Sara's head. They could always say that it was the head of the woman in the morgue in episode 1.
I used to be fans of other shows were fan favorite characters have been resurrected from the dead. In Alias, Michael Vartan's character was gunned to "death", yet he came back. In 24, Tony Almeida had a lethal drug injected to his heart, and he even died in Jack Bauer's arms...yet he's now returning for season seven. If they really want to do it, they can.
I'm sure if both sides talk amicably again, they can find a way to make it work. It's just so sad that we fans will never get the happy ending that Sara (and Michael) so much deserves.
I am with them 100% and as so many people are complaining that Prison Break is not the same without Sara, then do something about it! Get writing in! I've been in contact with SWC myself and she is a fantastic person. Get her back on the show! Watch the video below to see some of the work these people have put into this campaign:
Click here to access their website!