Will 343 end up retiring those like they’re doing with reach? They still have halo 2 stats up.
The only stats that are being retired are the detailed stats from the micro-site (accessed by clicking “More Stats” on your Reach overview page) - the main overview on your service record will remain for all games. Halo 3 doesn’t have a detailed stats micro-site, so nothing will change from that perspective. Halo 4’s micro-site is staying operational for now as far as I know