Most likely there wont be any changes to builds needed as the coming resistance changes wont affect the item choices at all. Current Best-In-Slot stuff will stay as is.
Guess pet performance will only be hit in “Deep SR” wich is anyway just a symptom of the “faulty” design made over the years wich wasnt able to keep pet survival scaling in check at all.
The best thing about this is that actually those changes might open up more hybrid builds being viable as there is less constraint about keeping everything functional on the player/pet side of stats at the same time.