The Hollywood Reporter has a list of endangered shows this year and their chances to stay on air:
“Smallville” & “Supernatural” — The nine-year-old “Smallville” contains an alarming lack of texting debutantes so naturally the CW dumped it on Fridays. Like Krypton crystal thrown into the snow, it bloomed in the wasteland and gave The CW a reliable performer on TV’s toughest night. “Supernatural” made a solid companion for “Vampire Diaries.” Both: 85%
Source: The Hollywood Reporter.
*Thanks to TVOvermind.com for the link.
Note: The CW has yet to give any official word on Supernatural's fate.