the better ending i came up with in my head

First off, I didn't see the twist coming. I saw it taking a different route. So i quite enjoyed the flick. However i did think it could have ended better. So here goes. At the end when the brunette gets in the car, the car doesn't stall. She gets away. The police get the blonde. Short sequence of conclusion. They show the blonde in the hospital blah blah. Fade to black. Then you see the roof of a car, the camera pans around and you see the brunette a short time later in the back of a new friends car. Copying the scene at the beginning but the brunette this time. Her family is dead, so a school friend, boyfriend, or other family member is driving. She asks her new friend, "are we there yet", and she has that look on her face like the blonde did in the security footage. And then the camera pans to the right out the passenger window and we see the rusty old truck. This time with a guy that obviously looks different.

The whole idea being the allusion that she has gone crazy herself and is bound to do the same thing that happened to her. The blonde's sexual frustration is what caused it this time, and who knows how and why and in what way it could jump to a new person. The only thing that stays the same is the truck. And i know the truck was supposed to be a part of the farm. but that got taken out of the film and i just learned that by reading some forum posts.

To me that is a bit more creepy, giving the psychosis that the blonde had a contagious quality.
Also it leaves a good ending for a sequel/prequel.
Any thoughts, comments?