Some stories lend themselves to any number of additional episodes or
movies while others seem to naturally demand a conclusion. I put BSG
and Lost in the latter category and most adventure movies and TV shows
in the former. Which would be most appropriate for the Terminator
franchise? I think it would get awfully dreary and depressing if there
was no final end. The Fugitive got that way after it was on too long.
I doubt that the producers care, though. They'll keep making them as
long as they show a profit.
