True. And I believe that EON is in a phase in which they want the most prestigious writers they can get - whether these actually can do a good Bond film or not. EON just wants to free Bond from the "unimportant pulp"-stigma of the first 20 films. The public will never know how much input from other writers, directors, actors actually will influence the script.
So, it just sounds better to attach a writer who also works for the theatre and wins awards instead of someone who is only a script writer, expert in doing spy action thrillers.