In recent seasons of Doctor Who, we've seen things regarding how others view and remember the Doctor. How the Silence perceive the Doctor, how the troops at Demon's Run know the Doctor, Oswin making the Daleks forget the Doctor, etc. We've also seen the Doctor get worn down by the weight of his memories (he's what, 1200 years old at this point?). As a way of refreshing the series, what if the Doctor's next regeneration was someone tied to a sort of amnesia? What if the Doctor suddenly didn't remember the Daleks, or why they fear him? What if he had to re-learn his own history from other people and sources? Would that be a cool plot point for a few seasons, or would it just ruin the show?