Yeah, pretty sure Talonflame will remain OU and will definitely remain strong in Battlespot/VGC but the change limits its options since it can't always get away with no/very low speed investment.
Im not too sure about that. Between SR damage, Brave Bird's recoil, and switching in on resisted moves, Gale Wings pretty much does nothing since TF loses health. It could maintain its healthy with a Roost/BU set, but I doubt having one successful set will keep it in OU. Maybe BL or UU