I think it's way too early to write off the A4S.....actually the Israelis "Improved Skyhawk" is not far better than the current RSAF A4S.
Actually, I think the avionics in the A4S is still better off. The ACE black box is actually the ACMI pod......of course I'm not sure if they have moved it into the airframe?

Those closer to the aircraft will know more.......
CAS role maybe relegated to the Apache.....but A4S can is still relevant - freeing up the Vipers for more figther bomber strike missions.
Maybe we should keep a few in flying state and the rest near flying state like the USAF's Air National Guard unit.