Tenure Saves Taxpayers Money Again

Here in Virginia it takes three years to earn our version of tenure.  Once earned, you maintain your tenured status for as long as you continue to work for that school division. Thus tenure creates an incentive for teachers to stick with a division over the long run.  Teachers stay with a division to earn tenure status and then continue with a division to maintain it.  It could be argued then that tenure helps to keep teacher turnover lower than it might otherwise be.  Lower turnover reduces the costs incurred by a division to recruit and train new teachers.  So again tenure saves taxpayers money by reducing costs, this time ones associated with recruitment, training, and retention.  

What do you think?  Does the argument make sense?