With aortic regurgitation the ejection fraction can decrease as the ventricle dilates. It is ideal to operate before this occurs, but certainly if it occurs because of the valve then it certainly requires surgery.
If the mitral valve leak is not severe, it may be functional MR from LV dilatation and high end diastolic pressures. These will likely improve after aortic valve surgery, and unless there is a structural abnormality of the valve it will not require replacement or repair.