But, Cutter John
, Doctor Who
is a series that is defined
by change. The actors change. The writers change. The look and feel of the series change. Justin Richards went as far as to say of Doctor Who
that "neither the Doctor nor the TARDIS are strictly speaking necessary."
And even if Gold were to stay around for the next season, there's no guarantee that Wenger and Moffat would want the type of music from Gold that RTD wanted. Look at the difference between the first and later seasons of Star Trek: The Next Generation
. Same composers, completely different sonic texture, because Bob Justman wanted a lush orchestral sound in the first season and Rick Berman wanted something muted, like sonic wallpaper, in later seasons.
Food for thought.