The decision in question is Jeff finally deciding to leave Denver and head for California, ostensibly to start a new life but really to chase down an amnesiac Fallon, who he thought was dead.
This marks the last time John James, Emma Samms and Maxwell Caulfield appear in the opening credits. James and Samms will return after the cancellation of The Colbys (1985) at the start of the eighth season of Dynasty (1981).