Sets? They release ONE(!) Ideas Doctor Who set (you dont seriously count the 2 Dimension Packs do you? :)
Sorry but this just shows that you dont know how lego operates :D
Just take a look at the 60 years of Lego Promo(!) Set 40290 which depicts four famous Lego sets
The yellow castle (375) from 1978, Space Cruiser and Moonbase (928) from 1979,
Black Seas Barracuda (6285) from 1989 and the Monorail Airport Shuttle (6399) from 1990.
Which are love and famous and would bring them money if they where being produced today and yet they
have not one of the four alike in their sortiment these days.
This is a prime example that Lego doesnt know or care what brings them money.
(another one would be bringing out Gokarts in the Friends franchise instead of City.....)