I also struggle with this as I haven't spoken to my father for nearly 8 years now.
I find that I really resent all the images in the media (films, books, tv programs etc) suggest very strongly that you get one last chance to make it up and if you refuse then the parent will die horribly/comit suicide and you will regret it for the rest of your life.
Its like a "punishment" for refusing to forgive all the bad stuff, and just pretend life is wonderful again.
I have thought about this too, my father (biologically anyway) wants to be in contact with me, so its very much down to me that there is no contact.
The thing is the only thing I feel for him anymore, and thats not very often, is guilt, as I know that he thinks we could have this loving caring relationship and that I have been turned against him by my mum and dad (step).
The problem is that he has no idea what hte issues are, and is incapable of change. I don't want anything to do iwth the person he is and am not prepared to support his "everything is your mother's fault" world.
Sorry, apparently the "issues are still alive" in answer to the OP, i have thought about this, and I think I will feel a little guilty about it again, but recongise (which has taken me years) that in the end, even though he doesn't realise it, that this is all down to his choises.