Good teachers have nothing to worry about.
The law says value-added data may be used in teacher evaluations. The law does not speak of consequences at the teacher level at all. In a teacher evaluation process, student achievement would always be only one of several components. The State teacher evaluation process has stipulated for several years that student data may be included in one's data sources. Because of safeguards included in computing the teacher effects, they will almost always be more positive than the corresponding school effects.