I would like to see a proper epic involving 2 or 3 episodes of a true Dalek story.
I too think they could use something a bit shocking to grab peoples attention. Maybe a story where quite early the Daleks exterminate someone the Doctor knows in order to break the "Well none of the main characters will die" cycle.
Then when the audience are surprised to see that go in with another bigger shock and actually use the Daleks to do the unthinkable and kill off his main companion.
That would shock the audience and get that threat back, while also getting the hate going between the Doctor and the Daleks again to top level.
Imagine the emotion if Clara and some of his other regular friends were truly killed off by the Daleks. That would crush the Doctor and would lead to an intense story and following sole searching.
This is the sort of thing they need to do with the Daleks.
Providing it was a decent overall plot, I believe that would be an epic 2 or 3 parter and give the Daleks there evil back and lead to real turmoil for the Doctor for a while to come.
It would really add to the legend IMO