Students can certainly initiate change in the curriculum. This was passed by EPC and taken to the full faculty, where it passed.
Most departments now have minors.
The recent initiative to create a Women's Studies major had strong student input, including a TCU Senate resolution. Administrators sit on all committees, although they typically do not have votes. The Dean of the Colleges works very closely with the chair of EPC to develop agendas for change. The deans of the faculty make final decisions about faculty hires, decisions which have long-term consequences for the shape of the curriculum. Committees and Task Forces .