As much as I would love to see Quicksilver and Scarlet Witch being in a Marvel Movie..it's not going to happen and it's very likely Weddon will have to write them out of the plot but who are going to replace them well. Here are the two that I hope replace them.
Namor
By doing this not only can they have their own dig back at Fox but they can also set up for a Namor Movie before DC ever do a Aquaman Movie. Yes Marvel is allowed to use him as long as he is not referred to as a Mutant and could be a great replacement for Quicksilver. I think he would work in Avengers 2...
My Choice:
Zachary Quinto
Ms. Marvel
A good replacement for Scarlet Witch and could tie in with the Guardians of the Galaxy Movie very well but revealing what the Kree are going to do in the MCU. She also has unique powers that could work on the big screen. She would be a great replacement for Scarlet Witch and i think she could work in Avengers 2
My Choice:
Charlize Theorn