Does giving Dresden the boot really help with that though?
If you are addressing that question to me, my thought is Langtry feels threatened by Harry. It isn't about power or knowledge, Langtry still has more juice and knowledge of magic than Harry, but Harry is out in the world where as he isn't. Harry has acquired a rep and allies, heck, his own army, small but mighty. When the flying squid things were attacking there were three if I remember correctly Senior Council members present, they couldn't do squat against them. Harry called up Za'Gard and they took care of it. It is called influence, Harry has a ton of it, that scares them.
No, the Doom was never lifted from Molly, technically Harry was dead or thought to be when she was under her death sentence. I think that became moot once she became Winter Lady, and as far as I know she hasn't acted all warlocky since she became Winter Lady.