They've expressed interest in taking it over, many times. The Air Force won't hear of it, of course. They don't want to do the mission, but neither do they want anyone else to do the mission.
The Air Force has no more choice than they do about keeping the A-10; if Congress directs the function, dollars, and personnel to the Army, that's where they go.
Further, that the Army has expressed willingness to take 360-degree responsibility for CAS doesn't change the fact that theor current perspective on fixed-wing CAS options comes from a place of not having that responsibility.
Oh, they don't mind giving up the mission. The AF offered to let the army have the A-10, but only as long as they got to keep the money they've been spending on it.
They've expressed interest in taking it over, many times. The Air Force won't hear of it, of course. They don't want to do the mission, but neither do they want anyone else to do the mission.