Originally Posted by def28
I think they need at least one X Girl added on the team. They only have like three members on the roster. They could barely win without Emma, Magneto and Mystique fighting them.
Like I said, I don't think they would need at least one X Girl added on the team especially if the X-Men from the future like Storm, Rogue or Shadowcat might join them in the battle to fight the Brotherhood.
And if they added a new X Girl to the 60s team and we haven't seen that character before, I'm afraid they might not give her (for example, Polaris) a proper introduction since the cast from the original trilogy might just outshine her.