IF (Big IF) this happens, it will be as a result of dumbing down the criteria for the gals. Men will continue to meet their current levels - the chicks will have lower standards.
Or - even worse - the standards for becoming a Marine will be so substandard that any he/she/it can qualify.
It would be like Marines with cheerleading squad. I’m not sure the guys would object too strenuously to that. Just issue camo pom-poms to the gruntrices.