I have thought for a while the govt should be the ones to really shake things up. First thing is the city of New York bars all heroes from having a headquaters in the city itself because of the years of property damage and being a target for attacks. This would mean the Avengers have to move out (along with the FF, and the X-Men). The second is the govt would come back in like they did in the 70's and 80's and basically say if the Avengers want to keep operating as a team they have to have more govt oversight. This would me having their identities on file and being somewhat trained. This would cause some members to quite. This wold also put the team under a little bit tighter leash.