Daleks To Be Given 'A Rest' From Dr. Who
donberryman writes "Steven Moffat told the BBC 'There's a problem with the Daleks. They are the most famous of the Doctor's adversaries and the most frequent, which means they are the most reliably defeatable enemies in the universe.'" And so, 400+ encounters later, both the Doctor and the daleks will take a break from each other.
They appeared fairly regularly in the "classic" series, but not quite as frequently as peoples' memories would lead them to believe.
Indeed, Doctors 5 through 7 only met them once each on-screen. 2 & 4 encountered them in two televised stories each, 3 bumped into them in 3 stories and 1 holds the record (if you count modern two-parters as single stories) at 5 televised meetings. I'm ignoring short "guest" appearances here, like the few minutes in the 5 doctors, and counting the last segment of Frontier in Space as a run-on to the full Dalek story that followed.
The fact that they didn't appear often heightened the excitement for the fans when they did and I agree with many that they have perhaps been overused in recent series, so giving their narrative a break for a bit certainly makes good sense to me.