They would be negotiating with themselves. Charter schools will siphon money away from districts, thus destroying the public school system. As students move from a district public school to a charter school in the same district, the money follows the student, just as if that student had moved to a different district. In other states, this competition for funds is having a positive, not negative, effect on school districts. Districts that are losing large numbers of students to charter schools often become more responsive to parents and community needs and institute new, specialized programs and improvement initiatives to attract families back to their schools.
Charter schools cater to a specialized population and thus are elitist and inequitable.
Nationally, statistics have shown that charter schools are serving a population very much like the groups currently served by traditional public schools. However, in many cases charter schools are actually serving a greater number of students who are often under-served in the American public school system. Charter schools threaten teachers unions. Teachers don't lose the right to union representation. Teachers in charter schools can unionize, but their bargaining unit would be separate from that of the district.