Yes: "an institution’s moving from tenure-track to non-tenure-track faculty results in reduced graduation and retention rates, lower GPAs, and diminished faculty-student interaction, among other undesirable effects. In a stunningly bad deal, universities have exchanged quality instruction for cost savings." https://www-chronicle-com.ezproxy.gc.cuny.edu/article/the-churn
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ack, sorry, looks like my Chronicle is paywalled, but if you can access the Chron look for the article on churn. If I get a download I'll post it here.