As part of the Vivendi / Activision merger, Vivendi's development teams will have to essentially re-sell their games to their new Activision overlords. Apparently, this has Sierra worried about their future.
Activision obviously made the move primarily for World of Warcraft and Blizzard, but the other games could get axed in the process.
However, games like Ghostbusters (video below) and The Bourne Conspiracy should be safe.
Next-Gen.biz: Report: Activision Could Kill Off Sierra Projects