With the introduction of Scarlet Witch and Quicksilver in The Avengers: Age of Ultron movie, we can only speculate the outcome of what will happen to the twins. There is a possibility that the twins maybe separated after the Ultron catastrophe. Quicksilver may end up aiding the Inhumans during their fight with Kree, fall in love with Crystal and learn his origin from the High Evolutionary.

As for Wanda, she knows that her powers are chaotic and unpredictable thus making her mentally unstable. She may choose to seek outside help without her brother (who has a short fuse) in order to control her powers which would lead her to the Ancient One. Most movie goers won't know this but Wanda's abilities were corrupted by the malevolence of Chthon, the author of the Darkhold, who cursed Wanda when she was born.

Why Chthon chose not to corrupt Quicksilver as well is beyond me. Maybe Chthon predicted that Quicksilver's rash nature of over-protecting his sister would inevitably drive her way and down a dark path. Far-fetched I know. The Ancient One has a knack for bringing in lost causes and molding them into guardians but at the same time, Scarlet may prove to be a difficult case since she has been touched by evil.

Which begs the question: Would Scarlet be more of a threat to the Avengers or to Dr. Strange? With the Infinity War coming up, Thanos and maybe the Red Skull would be the main villains to take the stage which might leave very little room for Scarlet and mental breakdown during Avengers Disassembled. What do u think?