Thanks for you encouragement about the HT (hormone tx). I had a prostatectomy in Oct. 2001 and at that time the ca had metastasized just slightly. It was at the margins of the prostate in several places and in one lymph node and the Gleason score was an appalling 9-10. Very scary. But I have been doing great. I am only 65, and very active. I show almost no PSA.
Anyway, re your dad: Realize that no matter what you do, you are not "giving up" on him. You have cared for him for a long time and will continue to do what you can do until the end of his earthly existence. As far as hospice, that's a hard decision for everyone from what I hear. You are a smart and thoughtful person, and I am sure you have thought about most all the options. Seems like that decision should be based on your capacity to care for him at his stage and as he deteriorates further (which he will, and probably soon), his own wants (which you haven't mentioned), your options re using other caretakers (like relatives), his finances, etc. Some people really want to die at home, and others feel badly about being a full-time burden to their caretaker(s) and would prefer to be in hospice. Hospice is generally a very caring place where folks nearing the end of life can get all the help that they need all the time from very caring and experienced professionals. Not a bad option when you think about it. And you would still visit him of course.
Re the infusion therapy: My limited knowledge about this says that it may help the symptoms on a very short-term basis, like days or a few weeks, especially for someone at your dad's stage. Or it may not help, and cause a lot of nasty side-effects.
Hope all this helps some in your deliberations.
Pat K.