My opinion is that Conservatives should play hardball on this.
Sure, let's abolish the Police Union, in return for sacrificing one of the only unions that tend to break more Republican, the Republicans need to demand an equal and proportional destruction of the Teacher's Unions or all Public Sector Unions if possible. If the Dems refuse, don't let them destroy the Police Union.
I would argue that for as many problems Police Unions have caused, Teachers Unions have actually caused considerably more damage to society.