More than likely, biochem will be a requirement. If you need it for the MCAT, they schools will add that. It's already "strongly recommended" at many schools.
I can see DO schools starting to strongly pull towards more humanities, social sciences etc as they try to differentiate from MD schools and create a highly sociable, relational doctor.
Unfortunately, it just makes things more difficult for the average, normal mature being and they have to comply with even more regulations, while just another class in social sciences may or may not do anything to put some common sense in the young pre-med mind.