You
can tell that Doctor Who is more inspired by Comics than Sci-Fi though, which is why it can be so divisive. One of people's pet hates of Marvel, for example, is the fact that they tend to rewrite history and give characters 'one-off' powers or knowledge that never gets used again. When you deal with a show which is
about mucking around in the timeline and changing history and alternate Universes etc, that becomes even more tempting.
I like the fact the Doctor now has a 'mission', to find Gallifrey, and it does sort of fit that Smith should be leaving at Christmas, his character has found a chance at the redemption the Doctor has been looking for over the last few regenerations, so a new Doctor for a new Situation sort of makes sense. Hopefully the Christmas episode will cover the Silence arc more completely, possibly even covering the destruction of the TARDIS, though that may be shrugged off as a 'Big Bang mk2 reset button' event, but I hope not.