Let's not completely give up on Miss Mars.

From blogcritics.org:

Veronica Mars the character is not dead yet though. Thomas recently has been in talks with DC Comics about bringing the teen detective to comic books, an opportunity he's enthusiastic about that will allow him to use the planned fourth season storylines. He's also contemplating a feature film script based on the character. "But the show is a thing of the past now," he reiterates.