Lame Duck Legislature Aims to Reform Teacher Tenure Laws

There is a report that Michigan's Lame Duck Legislature is drafting a proposed bill that would drastically alter teacher tenure laws.  (Read The Article Here)  Some of the changes would be that tenure would be tied to teacher evaluations, at least 50% of that evaluation would be based on student growth, which would be assessed using state assessments.  Teachers would then be rated either effective or ineffective.  Should teachers be granted tenure, but then in subsequent years achieve an ineffective rating, they would go back to probationary status.  At probationary status, they could eventually be dismissed.  What are your thoughts on this?