Your situation is not uncimmon! And no, he probably will not mellow out. In fact he will probably get worse. It's hard to believe since he is "only a bird," but a rooster can do you some serious harm. He has spurs of course but also claws, beak and wings. And he can easily jump as high as your head. I am not trying to scare you, just make you aware. Nobody is going to fault you for not keeping him, or for not being "patient" with him. Please do not feel that you have to justify your decision here. Way too many of us have gone through exactly what you are going through, and it is our collective voices of experience that are telling you: there is no good reason to keep him. 
