He was also removed from Batman after sales dropped. And some writers have much more status. We generally don't know the full story about the company's doings. And it is unlikely he would have any say over characters he does not own and a story he is not writing. Especially with company management in flux. However DC chooses to handle things following Identity Crisis 2: Electric Boogaloo, that is up to them. The company has final say in how their IPs are handled.