I respectfully disagree. He will still breed the hens, potentially become more aggressive with them while trying to "hang on". His breeding will also potentially lead to little cockerels carrying his genes and nasty personality.
As I stated before, there are so many good roosters that need...
Welcome to BYC.
I think you already know the answer. Don't feel bad, you've given him his chance.
There are so many good roosters that need homes. Give one or two of them a chance.