Here is a list of actors I think would be perfect for a recast of The Avengers.
This was a hard one to think of as I think RDJ pulls off the role perfectly, however, here is who I think would pull it off as well.
Robert Downey Jr.
I know, it is supposed to be a different person, but I can't think of anyone better to do the job as Iron Man.
I think that Chris Pine would have the cockiness that Hawkeye needs in the movies as he never misses. He has the attitude in Star Trek as cocky but responsible, so I have chosen him for the role.
Captain America/Stephen Amell
The way he acts as a responsible Oliver Queen, could he act as a responsible Captain America?
I couldn't think of anyone else as this took some time thinking of recasts.