6. With The Master Back We Also Have A Reason For Gallifrey To Return
Gallifrey is The Doctors home planet and also the home of his enemy, The Master. As The Master had been sucked into the time space vortex at the end of The End of Time, Part Two, for him to return, the explanation would have to be linked in with Gallifrey. As the series likes to advertise The Doctor as the last of the Timelords,it would be a cameo part. However, it would be good to see the planet of the Timelords one last time, especially when it is in conjunction with the return of one of its most famous sons.