While i think that NP's Jane Foster was kind of a bland presence in both Thor 1 and 2 i do think that she's in good hands with Taika and i feel that she's going to really shine in TLT, specially taking into account the material given to work with.
Taika normally manages to bring good performances from female cast members. For example in Ragnarok Hela and Valkyrie where both great in their own right. In Jojo, Scarlett Johansson and Thomasin Mckenzie also shined. Even Rachel House and "Bella" where solid good characters in Hunt For The Wilderpeople.
So there's precedent here for things to work out for the best. In TLT Taika will need to juggle a new and revamped version of Jane Foster, Valkyrie's royal return and Sif's comeback. Not an easy task but the precedent set before by Taika gives me confidence they will succeed.