Apparently, many people--such as Ken Allen, for one example--have approached Activision about the Sierra IPs, only to be told that Activision has "their own plans" for them.
What do you think these plans are? What do you think Activision's plans for the IPs are?
My theory: Let the various series collect dust outside of making quick money by re-releasing them via GOG. Deny the licenses to any future interested parties or accept only outlandish amounts of money to license or sell the series, with the end goal of the series never having any sort of revival(s).