3. We Wouldn't Like: No Zygon Doctors
If you don't know, the Zygon are a race of shape-shifting aliens back from the Classic series. I'm acting like I knew this before, however like most new-generation Whovians, I actually found this out after seeing that they were going to be in The Day of the Doctor. However, nonetheless I've now heard enough to know that we're dealing with shape-shifters who must keep the person they're copying alive. This implications of this are, no doubt, very fun. Maybe we'll get a couple of extra Queen Bess's running around? But one thing we really, really don't want to see is yet another Doctor. As I've already laid out before, I think two (or three) Doctors are enough we don't need to complicate that with an evil-twin Doctor jumping in as well. It will just get a bit silly something that needs to be reigned in a bit with the seriousness of the Time War involved.