ML-KEM and ML-DSA are not "known weak". The justification for hybrid crypto is that they might have classical cryptanalytical results we aren't aware of, although there's a hardness reduction for lattice problems showing they're NP-hard, while we only suspect RSA+DLog are somewhere in NP. That's reasonable as a maximal-safety measure, but comes with additional cost.

Obviously the standard will be used. As I said in a sibling comment, the US Government fully intends to do this whether the IETF makes a standard or not.