If I'm not mistaken, the BBC's agreement with the Nation estate says that Daleks need to be seen in each "series" of Doctor Who.
I thought that was proven to be a myth.
For some reason, I thought that Moffat had denied that there was any such agreement. However, my Google searches for such a denial have been fruitless. :-/
I'd be very happy with a year (or two... or three...) without Daleks. Make the Daleks special again.
