Quote:
“Look at the three mentioned in the thread title. You could instead substitute 'Robot Enemy', 'Cyborg Enemy', 'Humanoid Enemy'.”
I take it you were classing Daleks as the "Robot Enemy" when they are as much a Cyborg as the Cybermen are.
Out of the New Series Monsters that have recurred up till now (Slitheen, Pilot Fish, Ood and Cassandra, any I'm missing?) I can't see any returning to DW as "Monsters".
Cassandra's story has been told, the Ood while they may return won't be as Monsters, Pilot Fish I just can't see the point of again and the Slitheen have found a new nemesis in Sarah Jane so any future appearances will be in her show (unless Rose comes back as a full time companion then they will probably reappear in DW).
Out of the new series Monsters that have yet to make a comeback there's only a few I could see doing it.
The Krilletanes are the obvious one, as said they could be in a totally different form but it would be good if Mr Finch stayed as he was to give the Doctor a new "Humanoid Enemy" apart from the Master.
The Sycorax could easily make a reappearance, maybe not invading Earth again but it's a big Universe out there.
The Juddoon, well we'll probably see them again.
As said Steven Moffats trio of Villains are some of the best New Who as come up with but all are really one shot Monsters, the Weeping Angels are the only ones I could possibly see being in another story as bad guys but it would have to be very different to Blink to make it worth while. The Clockwork droids could reapear but not as Villians.
Some other possibles, The Wire (well not her as such but maybe encounter her race), The Gelth and maybe The Devil.
As to the original point of the thread, I don't think any of the Daleks, Cybermen or Master should be written off completely but the daleks should be rested for a while.