The reality is that "organizational" decentralization may stop at the bishop. However, Christ-ian "decentralization" does not stop there.  It passes on to the individual conscience. It is the bishop role to ensure that the individual is informed and formed and then the individual with his/her knowledge (which is not limited to that of the bishop) in her/his discernment comes to judgment. If hierarchy is incompetent and/or irresponsible in its "teaching authority", even if "legitimate",  the sad reality is dissent, decline, abandonment (of institution). If I leave the church,  if I am "dis-membered" do I abandon my baptism, my incorporation in Christ? I say no.