Yes, this is exactly how you protect excellent teachers – by making it easier to fire them.
Currently, if teachers are furloughed, those with least seniority go first. Under this new law, teachers would be let go based on their academic rating. Teachers can have one of four ratings: Distinguished, Proficient, Needs Improvement and Failing. Under the new legislation, teachers rated Failing would be furloughed first, followed by those under Needs Improvement, etc. Within those categories decisions would be made based on seniority.
It sounds great – if you know absolutely nothing about Pennsylvania public schools.