HOw long before the temp craze hits teaching?

Temporary employment is up 50% since the 'end' of the recession. More employers are going through temp agencies and labor contractors, rather than hire directly. This used to be a way to shift benefit costs and liability to a third party. Now it's just a way to keep wages artificially low.
http://www.huffingtonpost.com/2013/07/08/temp-jobs_n_3562180.html