James is right about these two quick ways to kill off blogging in education. This is partially because of the ubiquitous but unnatural dissection of our education system into years, semesters and courses rather than dividing our education by students, topics and lives.
Blogging works best when it is a part of a persons life, meaning that it is a way that they work rather than a course requirement. It works best when it is owned by the individual student rather than being an element of a class they are taking. It works best when it is not forced. In short it cannot belong to the institution and it can rarely work as a requirement.
If we already know exactly how to kill blogging in education let us ask how we can avoid these easy deaths.