Why should those who dreamed up exploitative part-time teaching positions be exempt from their own logic? Private enterprise could supply all sorts of part-time administrative clerks to the university at a fraction of the present in-house costs.Why indeed?
There are a number of wonderful administrators, but there are also cases where the exploits of the administrators are far worse than those of the faculty. At least poorly performing adjunct administrators would be easier to rid oneself of.
Hanson's ideas deserve careful consideration. I suggest reading the whole article.