Something else that would help Green Lantern sell: get rid of the Corps.
Let Hal, Guy, John, Kyle, Simon, Jessica and one or two alien GLs keep their rings and destroy OA and the Guardians, let all the other GLs retire into limbo. Make the seven or eight remaining GLs be the Green Lantern Corps and put them on Earth.
Give them traditional Earth-based villains, with a few trips into space.
This would not only help the GLs, but it would also give DC an opportunity to develop other space heroes again.