One thing that seems noticeable with the Roger Moore films in particular is that Bond tried to copy existing trends at the time. Some have said the Craig films have also had some Bourne influence, particularly Quantum with Bond going largely rogue and the 'shaky cam'.
There's been some ocassional spin-off rumors for characters like Felix, Wai Lin and Jinx, but I think only the Jinx film made it at least to script stage before dropped in favor of a full reboot.