I can't give you the exact reason. But I can say that the more specialized a university program is, the harder it is to offer the program across a number of universities, and that is due to the small number of people in certain communities. There is no way all the universities could offer those specialized programs. That's why we're trying to work together more at the university level: to make those programs more accessible around the country.
On November 25th, 2013. See this statement in context.