The thing is, due to the ability to overmeld crafted gear, the same situation would still exist. Depending on substat allocation for the crafted, the old BiS, and the normal mode raid gear of the subsequent patch, some of the old BiS will till be good to use at the start of the patch. Yet, even if the crafted gear was the same iLvl as the old BiS, due to substat allocation and the ability to overmeld, a lot of it would still outright beat the old BiS or replace it with pentamelds.

To make crafted gear worse than old BiS you would have to make sure that none of the pieces have substats that align with the old BiS or trump them, and then also make their iLvl lower. That'd make them nearly pointless.