It seems to me desirable that those who teach at universities should have some level of professionalism, as school and TAFE teachers do. However, because higher education teaches adults and also teaches new knowledge, there may be an argument that a more open approach can be taken.
In the terms of Warren Piper's criteria in "Are Professors Professional?", which John Dearn cited, university academics are only part time teachers and are not professionals. This is not to demean them, they are probably professionals in another profession (as an example I am an ICT professional who also does some teaching).
Also I find of interest "Developing a supportive culture for teaching and learning : a university, faculty and school perspective", Roberts, Carole, Anderson, Lisa, Betts, Martin, & Oakey, Dorothy (2002).