Systems thinking describes how systems are organised, unfold and change and how this should be managed. MBA programmes do the same regarding business organisations.
Systems thinking is (w)holistic. (Note: Wholistic means considering wholes, while holistic implies that there is emergence at the level of the whole). By comparison, MBA programmes are fragmented. Their curriculum is designed on a subject (i.e. function) specific basis. Even systems thinking is treated as a subject and in rare cases it is delivered as an action learning programme.
To make MBA programmes systemic would imply that the whole MBA curriculum is designed as a systemic and integrated action learning programme, based on a meta-systems paradigm (e.g. Biomatrix Systems Theory). This would imply that systems thinking is not a specific subject but is the meta-discipline within which all subject specific knowledge is contextualised and the interaction between subjects is organised.