Originally Posted by Mr. Dent
Maybe they can do a movie with Scarlet Witch and Quicksilver? That way it would be a film focused on their sibling relationship and would make Quicksilver relevant.
Kevin Feige has talked of his desire to do an Inhumans movie so Pietro is important for that. Marvel doesn't have Johnny Storm, but Quicksilver can serve as the link between the Inhumans and the wider MCU via his relationship with Crystal. Having said that, Wanda is really the more important of the two and she should be the focus when they're introduced in TA. Wanda is a core Avenger, while her brother is less necessary to the team.
Depending on how things line up, I could see Pietro only sticking around briefly because he's such an anti-social jerkass. Just introducing him with Wanda and then sending him packing for Attilan might be a good move. Also, Tom Felton was born to play Quicksilver, if the character ever makes it to the MCU.