Minghoo, the porblem is we can only speculate on the happenings at ATW at this point. We don't even know if there will be an ATW anymore in the near future. It might well be that their index and search tech gets completely merged into AV and or INK. In any case I would not really recommend doing changes just for the sake of getting back into ATW. Doing changes your site generally could profit from are of course fine.