Headways on trains likely wouldn’t be significantly impacted; but this theoretically frees up their staff significantly to improve bus service, which is constantly and frequently impacted by staffing issues.

Edit: I was misinformed! I looked it up, and ATO wouldn’t actually move any train operators from the car, they would simply be doing other things and not worrying about driving. Seems like it would be an even more boring job than it might already be!